Flying, ward {1}
Whenever you cast an instant or sorcery spell, mill a card. Return an instant or sorcery card milled this way to your hand. If you can't, put a +1/+1 counter on Covetous Frostwyrm.

This spell can't be countered.
Flying, ward {3}
Whenever Hoarding Culebre enters the battlefield or attacks, draw a card. Then if you have five or more cards in hand, create a Treasure token.

Flying
When Malicious Skycleaver enters, pay any amount of life. It deals that much damage to each other creature.
Cybersoul {5}{B}{B}

Flying
Whenever Molten Slagmaw enters the battlefield or attacks, each opponent sacrifices an artifact or nonbasic land.

Flying, haste
When Plasmana Hellkite enters, it deals 2 damage to any target and 1 damage to any other target.

Flying
Ward—Sacrifice a nonland, nontoken permanent.
Whenever a creature dies, Shredding Dragon deals 1 damage to any target.

Flying, trample, lifelink
Ward—Pay 7 life.

Flying, haste
Instant and sorcery spells cost {2} less to cast.
Whenever an opponent casts their second spell each turn, create a 5/5 red Dragon enchantment creature token with flying.

Flying
Ward—{2}, Pay 2 life.
Whenever you cast a noncreature spell, draw a card.