Creatures you control have flying.

Creatures your opponents control lose flying and can't have or gain flying.

Flying

Devour 1 (As this enters the battlefield, you may sacrifice any number of creatures. This creature enters the battlefield with that many +1/+1 counters on it.)

Whenever Fell Beast of Mordor enters the battlefield or attacks, target opponent loses X life and you gain X life, where X is the number of +1/+1 counters on it.

When Greed's Gambit enters the battlefield, you draw three cards, gain 6 life, and create three 2/1 black Bat creature tokens with flying.

At the beginning of your end step, you discard a card, lose 2 life, and sacrifice a creature.

When Greed's Gambit leaves the battlefield, you discard three cards, lose 6 life, and sacrifice three creatures.

Flying, haste

Whenever Klauth, Unrivaled Ancient attacks, add X mana in any combination of colors, where X is the total power of attacking creatures. Spend this mana only to cast spells. Until end of turn, you don't lose this mana as steps and phases end.

Reach (This creature can block creatures with flying.)

Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)

Whenever another creature dies, each opponent loses 1 life.

More Than Meets the Eye (You may cast this card converted for .)

Flying

Whenever you draw a card, if you're the monarch, target opponent loses 2 life.

Whenever one or more creatures deal combat damage to you, convert Starscream.

Flying

: Tap all creatures with toughness 2 or less.

: All other creatures lose flying until end of turn.

Affinity for planeswalkers (This spell costs less to cast for each planeswalker you control.)

Flying, vigilance

Whenever an opponent attacks with creatures, if two or more of those creatures are attacking you and/or planeswalkers you control, that opponent loses 3 life and you draw a card.

Attacking creatures with flying get -2/-2 and lose flying until end of turn.

Flying, intimidate, trample (A creature with intimidate can't be blocked except by artifact creatures and/or creatures that share a color with it.)

Whenever a player loses the game, put thirteen +1/+1 counters on Withengar Unbound.