Wingrattle Scarecrow has flying as long as you control a blue creature.
Wingrattle Scarecrow has persist as long as you control a black creature. (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)

Enchant creature
Enchanted creature gets +1/+0 and has flying and first strike.

Enchant creature
Enchanted creature gets +1/+3 and has flying.

Equipped creature has flying.
Sacrifice Wings of Hubris: Equipped creature can't be blocked this turn. Sacrifice it at the beginning of the next end step.
Equip (: Attach to target creature you control. Equip only as a sorcery.)

Changeling (This card is every creature type.)
Until end of turn, target creature has base power and toughness 4/4, gains all creature types, and gains flying.

Flying
Melee (Whenever this creature attacks, it gets +1/+1 until end of turn for each opponent you attacked this combat.)

When Wingspan Mentor enters the battlefield, put a flying counter on target non-Human creature you control.
, : Put a +1/+1 counter on each creature you control with flying.

Flying
Heroic — Whenever you cast a spell that targets Wingsteed Rider, put a +1/+1 counter on Wingsteed Rider.

Destroy target nonland permanent if another permanent with the same name is on the battlefield.
Draw a card.

As long as Winter Orb is untapped, players can't untap more than one land during their untap steps.

Cast this spell only during combat before blockers are declared.
X can't be greater than the number of snow lands you control.
Choose X target attacking creatures. For each of those creatures, its controller may pay or . If that player doesn't, destroy that creature at end of combat. If that player pays only , prevent all combat damage that would be dealt to and dealt by that creature this combat.

Enchant creature
When Winter's Rest enters the battlefield, tap enchanted creature.
As long as you control another snow permanent, enchanted creature doesn't untap during its controller's untap step.

Wintermoon Mesa enters the battlefield tapped.
: Add .
, , Sacrifice Wintermoon Mesa: Tap two target lands.

Split second (As long as this spell is on the stack, players can't cast spells or activate abilities that aren't mana abilities.)
Return target permanent to its owner's hand.

Exile target enchantment.
Cycling (, Discard this card: Draw a card.)

Wirecat can't attack or block if an enchantment is on the battlefield.

, : Flip a coin. If you win the flip, create a 2/2 colorless Insect artifact creature token with flying named Wirefly. If you lose the flip, destroy all permanents named Wirefly.

Defender
: Wishful Merfolk loses defender and becomes a Human until end of turn.

: Target creature gains protection from the color of its controller's choice until end of turn. Any player may activate this ability.