Mind's Dilation

Whenever an opponent casts their first spell each turn, that player exiles the top card of their library. If it's a nonland card, you may cast it without paying its mana cost.

West Coast Expansion

Draw X cards. If X is 5 or more, you may cast a Hero spell from your hand without paying its mana cost.

Treasure

Shapeshifter

Black Market Connections

At the beginning of your first main phase, choose one or more —
• Sell Contraband — Create a Treasure token. You lose 1 life.
• Buy Information — Draw a card. You lose 2 life.
• Hire a Mercenary — Create a 3/2 colorless Shapeshifter creature token with changeling. You lose 3 life. (It is every creature type.)

Damocles Base, Sword of Kang

Flying, deathtouch
Whenever Damocles Base deals combat damage to a player, that player faces a villainous choice — They sacrifice a nontoken creature of their choice, or they lose 2 life and you draw two cards.
Crew 3

Endless Ranks of HYDRA

Villain

For each opponent, you create a 2/1 black Villain creature token with menace.
Whenever your commander enters or attacks, you may pay {1}{B}. If you do, return this card from your graveyard to your hand.

The Frightful Four

Menace
Whenever an opponent casts their first noncreature spell each turn, that player loses life equal to that spell's mana value.

Kang Dynasty

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I, II — For each opponent, tap up to one target creature that player controls. Goad those creatures. Until your next turn, whenever any of those creatures deals combat damage to a player, draw a card.
III — Target creature you control gets +1/+1 until end of turn for each card in your hand and can't be blocked this turn.

Iron Monger, Sadistic Tycoon

Flying
Whenever a creature you control connives, put a +1/+1 counter on each Villain you control.

Kindred Dominance

Choose a creature type. Destroy all creatures that aren't of the chosen type.

Klaw, Master of Sound

Deathtouch
Whenever you play a card from exile, Klaw gains indestructible until end of turn.
Whenever Klaw deals combat damage to a player, look at the top card of that player's library, then exile it face down. You may play it for as long as it remains exiled. Mana of any type can be spent to cast a spell this way.

Lethal Scheme

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.)
Destroy target creature or planeswalker. Each creature that convoked this spell connives. (Draw a card, then discard a card. If you discarded a nonland card, put a +1/+1 counter on that creature.)

Toxic Deluge

As an additional cost to cast this spell, pay X life.
All creatures get -X/-X until end of turn.

Abomination, World Ravager

Menace, trample
Mayhem {4}{R} (You may cast this card from your graveyard for {4}{R} if you discarded it this turn. Timing rules still apply.)

Alicia Masters, Skilled Sculptor

At the beginning of combat on your turn, if you've cast a noncreature spell this turn, create a Treasure token.
Sense the Good — At the beginning of your end step, each player gains control of all creatures they own.

Batroc the Leaper

Multikicker {2} (You may pay an additional {2} any number of times as you cast this spell.)
Batroc enters with a +1/+1 counter on him for each time he was kicked.
When Batroc enters, he deals damage equal to his power to each of up to X targets, where X is the number of times he was kicked.

Blasphemous Act

This spell costs {1} less to cast for each creature on the battlefield.
Blasphemous Act deals 13 damage to each creature.

Marvel Super Heroes Commander