Flying
Whenever Abyssal Specter deals damage to a player, that player discards a card.

Trample
Whenever another artifact enters the battlefield, put a +1/+1 counter on Arcbound Crusher.
Modular 1 (This creature enters the battlefield with a +1/+1 counter on it. When it dies, you may put its +1/+1 counters on target artifact creature.)

Protection from black and from red
Whenever another creature enters the battlefield, you may gain 1 life.

Prevent all combat damage target creature would deal this turn.
Prevent all combat damage that would be dealt to target creature this turn.

, Sacrifice a permanent: Return target creature to its owner's hand.

Sacrifice a creature: Regenerate Cateran Overlord.
, : Search your library for a Mercenary permanent card with converted mana cost 6 or less and put it onto the battlefield. Then shuffle your library.

: Chimeric Coils becomes an X/X Construct artifact creature. Sacrifice it at the beginning of the next end step.

Whenever an opponent casts a nonartifact spell, put a charge counter on Chimeric Egg.
Remove three charge counters from Chimeric Egg: Chimeric Egg becomes a 6/6 Construct artifact creature with trample until end of turn.

: Chimeric Staff becomes an X/X Construct artifact creature until end of turn.

Flying
Cloud Elemental can block only creatures with flying.

Target player draws three cards. Then that player discards two cards unless they discard a land card.

At the beginning of each upkeep, creatures you control gain flying until end of turn if a creature you control has flying. The same is true for fear, first strike, double strike, landwalk, protection, trample, and vigilance.

Whenever a creature becomes the target of a spell or ability, return that creature to its owner's hand. (It won't be affected by the spell or ability.)

Target opponent sacrifices a creature.

: D'Avenant Healer deals 1 damage to target attacking or blocking creature.
: Prevent the next 1 damage that would be dealt to any target this turn.

Target player reveals their hand. You choose a nonland card from it. That player discards that card.

( can be paid with either or .)
Flying
Each instant and sorcery spell you cast has replicate. The replicate cost is equal to its mana cost. (When you cast it, copy it for each time you paid its replicate cost. You may choose new targets for the copies.)

Protection from white
At the beginning of your end step, you lose 4 life.
Whenever a creature dies, you gain 2 life.

Fear (This creature can't be blocked except by artifact creatures and/or black creatures.)

Target player sacrifices two attacking creatures.