Can a creature with defender block?

Yes, absolutely. Defender only prevents a creature from attacking — it has no effect on blocking. A 0/8 Wall with defender can block every turn without any restriction.

Can you make a creature with defender attack?

Yes, with the right card. Arcades, the Strategist, High Alert, Assault Formation, Rolling Stones, and Warmonger's Chariot all let defender creatures attack in different ways. These cards are the foundation of a popular Commander archetype built around high-toughness creatures.

Does giving a creature defender remove its existing abilities?

Not on its own — defender is just a keyword that stops the creature from attacking. However, some specific cards that grant defender (like Deep Freeze and Stasis Field) also explicitly remove other abilities as part of their own text. That's the card doing the work, not defender itself.

Can you give an opponent's creature defender to stop it from attacking?

Yes, and this is a real strategy. Cards like Guard Duty, Sky Tether, Deep Freeze, and Stasis Field can be attached to any creature, including opponents'. Giving a dangerous attacker defender permanently locks it out of combat, which is sometimes better than destroying it outright.

When was defender introduced, and what happened to old Wall cards?

Defender was introduced as a keyword in Ravnica: City of Guilds (2005). Before that, Walls couldn't attack by an informal rule tied to their creature type. When defender was introduced, older Wall cards were errata'd to have the defender keyword, separating the flavour of being a Wall from the rules restriction of not being able to attack.

Defender in MTG: Rules, Strategy & Notable Cards

Q: What happens if a creature has defender twice?

Nothing extra — the Comprehensive Rules (CR 702.3c) explicitly state that multiple instances of defender on the same creature are redundant. It still just can't attack. There's no stacking penalty or additional effect.

Some creatures are built to hold a line, not charge into battle. Defender is the keyword that makes that official - a simple, clean restriction that has shaped how players think about walls, fortresses, and defensive strategies since Magic's earliest days.

What is Defender?

Defender is a static keyword ability that prevents a creature from attacking. That's the whole thing. A creature with defender can block, tap for abilities, contribute to your board - it just can't be declared as an attacker.

The reminder text you'll see on cards puts it plainly: "(This creature can't attack.)" If you've ever played with a Wall, you've already played with defender, even if the card was printed before the keyword existed.

Rules note: Defender replaced the old "Wall" creature type restriction on attacking. Before the keyword was introduced, Walls simply couldn't attack by tribal convention. Defender formalized that into a mechanical rule that can appear on any creature, not just Walls.

Rules

Defender is governed by Comprehensive Rules 702.3. Here's what the rules actually say:

"702.3a Defender is a static ability. 702.3b A creature with defender can't attack. 702.3c Multiple instances of defender on the same creature are redundant."

CR 702.3

A few things worth unpacking from that:

Static ability means defender is always on. There's no trigger, no cost, no window - the moment a creature has defender, it is locked out of attacking. You can't pay mana to ignore it, and it doesn't wear off at end of turn unless something specifically removes it.

Multiple instances are redundant. If somehow a creature gained defender twice - say, from two different Aura enchantments - it still just can't attack. There's no additional penalty and no weird stacking interaction. It's the same restriction applied twice, which is the same as applying it once.

Common misunderstandings

Defender doesn't prevent blocking. A creature with defender can block freely. This trips up newer players sometimes - being unable to attack doesn't mean being unable to defend.
Defender doesn't stop activated abilities. A Wall with a tap ability can still use it. The restriction is specifically and only about attacking.
You can grant defender to opponent's creatures. Several cards do exactly this as a control tool - effectively locking down an attacker by giving it defender.

Circumventing defender

Several cards let your defender creatures attack anyway, which opens up a whole archetype. Cards that remove or ignore the restriction include:

Arcades, the Strategist - your creatures with defender can attack, and deal damage equal to their toughness instead of power
High Alert - same effect as Arcades in Enchantment form, also lets you untap creatures using their toughness
Assault Formation - creatures assign combat damage using toughness, and you can pay {G} to give all creatures with defender the ability to attack
Rolling Stones - all Wall creatures can attack
Animate Wall - one target Wall gains the ability to attack
Wakestone Gargoyle - pay {1}{W}: creatures with defender can attack this turn
Warmonger's Chariot - equip it to a defender creature and that creature can attack (and gets +2/+2)
Teyo, Aegis Adept - can grant a creature the ability to attack despite having defender, perpetually

Granting defender to other creatures

You can also use defender offensively - giving it to your opponent's creatures to shut down their attack:

Guard Duty - simple Aura that slaps defender on any creature
Sky Tether - Aura that grants defender and removes flying (great against angels and spirits)
Deep Freeze - turns a creature into a 0/4 blue Wall with defender and strips its other abilities
Stasis Field - similar lockdown Aura, turns the creature into a 0/2
Gelid Shackles - pay {S} (snow mana) to grant defender until end of turn
Dormant Sliver - gives all Slivers defender (a double-edged sword in Sliver decks)

Strategy

Playing with defender creatures

The obvious home for defender creatures is any deck that wants to survive long enough to execute a slower plan. A well-timed blocker with 8 toughness buys you multiple turns against aggressive strategies, especially in formats where aggressive decks rely on small creatures repeatedly.

In Commander especially, defender creatures often come with powerful abilities - card draw, mana generation, or enter-the-battlefield triggers - that have nothing to do with combat. The restriction on attacking is essentially a design tax that lets Wizards print the rest of the card text at a discount.

The toughness-matters archetype is where defender strategies get genuinely exciting. Arcades, the Strategist is the flagship Commander for this style: build a deck full of high-toughness Wall creatures, and they attack as a board of 5/5s, 6/6s, and 8/8s. It's a real strategy, and it blindsides tables that assume defender creatures are strictly passive.

Playing against defender creatures

If your opponent has locked down a creature with Guard Duty or Sky Tether, the cleanest answer is to destroy or bounce the enchantment rather than the creature. Enchantment removal like Disenchant or Naturalize gets your attacker back immediately.

Against toughness-matters decks, remember that these creatures become lethal attackers the moment Arcades or High Alert hits the table. Prioritise removing the enabler, not the individual Walls - a 0/8 is harmless until it isn't.

Deck-building considerations

In Commander, Arcades, the Strategist turns the defender restriction into a genuine build-around theme. Look for creatures with high toughness and useful enter-the-battlefield abilities.
In Limited (Draft and Sealed), defender creatures are often excellent stabilizers at common and uncommon. Don't overlook them - a 0/6 blocker can lock out an entire aggressive board.
In Constructed formats, using Guard Duty or Sky Tether as removal is a legitimate sideboard strategy in white-based decks, especially against flying threats.

Notable cards

Arcades, the Strategist

The heart of the defender archetype in Commander. A 3/5 flyer for {1}{G}{W}{U} that draws a card whenever a creature with defender enters the battlefield under your control, and lets all your defenders assign combat damage using toughness. He transforms every Wall in your deck from a speedbump into a threat.

High Alert

The Enchantment version of Arcades's combat ability. For {1}{W}{U}, your creatures assign combat damage using toughness and can attack despite having defender. The activated ability ({2}{W}{U}: untap target creature) is a bonus. If Arcades gets removed, High Alert keeps the engine running.

Assault Formation

The {G} version. Cheaper than High Alert, it also lets you pump all your defenders into attackers for a single {G} activation. A strong redundancy piece in any toughness-matters build.

Guard Duty

A {W} Aura that does one thing: give a creature defender. It's the cleanest, cheapest way to lock down an opposing threat in white's color identity. No frills, no upside - just a permanent "this creature can't attack" sticker.

Sky Tether

Superior to Guard Duty in most contexts - same cost, but it also removes flying from the enchanted creature. Slapping this on an opposing Baneslayer Angel or Lyra Dawnbringer takes away both its evasion and its ability to swing at you. Strong sideboard card.

Deep Freeze

A control tool more than a defender synergy card - it turns any creature into a 0/4 blue Wall with defender and strips all its other abilities. Functionally removes a threat from the game for as long as the Aura stays attached.

Dormant Sliver

A cautionary tale in Sliver decks. It gives all Slivers defender, which pairs with draw effects (in older versions of the card) but cripples your whole team's ability to attack. Most Sliver pilots treat it as a niche defensive piece or avoid it entirely.

Warmonger's Chariot

A simple Equipment answer for a single defender creature. Equip for {3}, and the creature both gains the ability to attack and gets +2/+2. Not the most efficient effect, but useful in formats where Arcades-style enchantments aren't available.

History

The word "defender" didn't exist in Magic's early years - but the concept did. Walls were introduced in Alpha (1993) with a hard-coded tribal restriction: Walls couldn't attack, full stop. This wasn't a printed keyword; it was an assumed rule based on creature type.

Over time, that informal convention created problems. What if a non-Wall creature should be unable to attack? What if a Wall should be able to? The creature type was doing double duty as both a flavour category and a rules restriction, which is awkward design.

Defender was introduced in Ravnica: City of Guilds (2005) to separate those two concerns cleanly. Now, "Wall" is just a creature subtype with no rules baggage - a creature is a Wall because it flavourfully is one, and it has defender because the keyword says so. The two can travel together or separately.

This meant that older Wall cards were errata'd to have defender rather than relying on the implicit rule. It also opened the door for non-Wall creatures to carry the keyword - things like fortresses, barriers, and immovable objects that make flavourful sense as unable to attack, regardless of their creature type.

The defender keyword has remained mechanically stable since its introduction. The design space has grown richer around it - particularly with the toughness-matters archetype that Arcades, the Strategist (from Core Set 2019) crystallized into a full Commander strategy - but the rule itself hasn't changed. A creature with defender can't attack. That's been true since 2005, and it's still true today.