Lightning Strike

Lightning Strike deals 3 damage to any target.

Loki Laufeyson

{1}, {T}: When you next cast an instant or sorcery spell with mana value less than or equal to Loki's power this turn, copy that spell. You may choose new targets for the copy.
Power-up — {4}{R}: Put two +1/+1 counters on Loki. (Activate each power-up ability only once. Reduce the cost by his mana cost if he entered this turn.)

Machinesmith Automaton

Trample
Whenever another artifact you control enters, put a +1/+1 counter on this creature.

Misty Knight, Hero for Hire

{2}, {T}, Discard a card: Draw a card for each card you've discarded this turn.

Mjölnir, Hammer of Thor

When Mjölnir enters, it deals 4 damage to up to one target creature.
Double all damage equipped creature would deal.
Equip worthy {1} (A creature is worthy if it's a legendary non-Villain that's red and/or white.)
{2}{R}, Discard this card: It deals 2 damage to each creature.

Photon Blast Barrage

When you cast this spell, copy it X times. You may choose new targets for the copies.
Photon Blast Barrage deals 1 damage to target creature.

Quicksilver, Brash Blur

If Quicksilver, Brash Blur is in your opening hand, you may begin the game with him on the battlefield.
Haste
Power-up — {4}{R}: Put a +1/+1 counter and a double strike counter on Quicksilver. (Activate each power-up ability only once. Reduce the cost by his mana cost if he entered this turn.)

Red Hulk

Reach, trample
Enrage — Whenever Red Hulk is dealt damage, put a +1/+1 counter on him. When you do, he deals damage equal to the number of +1/+1 counters on him to any other target.

Helicarrier Strike

Teamwork 2 (As an additional cost to cast this spell, you may tap any number of creatures you control with total power 2 or more.)
Helicarrier Strike deals 2 damage to target attacking or blocking creature. If this spell was cast using teamwork, it deals 4 damage to that creature instead.

Repulsor Blast

Teamwork 2 (As an additional cost to cast this spell, you may tap any number of creatures you control with total power 2 or more.)
Repulsor Blast deals 5 damage to target creature. If this spell was cast using teamwork, it also deals 2 damage to that creature's controller.

The Scarlet Witch

Instant and sorcery spells you cast with mana value 4 or greater cost {X} less to cast, where X is The Scarlet Witch's power.

Speed, Young Avenger

Haste
Whenever you cast a noncreature spell, you may pay {1}. When you do, target creature with haste can't be blocked this turn except by creatures with haste.

Treasure

Stark Industries Executive

{2}, {T}: Create a Treasure token. (It's an artifact with "{T}, Sacrifice this token: Add one mana of any color.")

Super Speed

Flash
Enchant creature
When this Aura enters, enchanted creature gains first strike until end of turn.
Enchanted creature gets +1/+0 and has haste.

Team Tactics

Teamwork 1 (As an additional cost to cast this spell, you may tap any number of creatures you control with total power 1 or more.)
Target creature gains double strike until end of turn. If this spell was cast using teamwork, that creature also gains trample until end of turn.

Thor, God of Thunder

Flying
When Thor enters, exile target Equipment, instant, or sorcery card from your graveyard. Until the end of your next turn, you may play that card.
Whenever you cast a noncreature spell, Thor deals damage equal to that spell's mana value to any target.

Marvel Super Heroes