Flying Lifelink (Damage dealt by this creature also causes you to gain that much life.)

Flying Whenever this creature or another creature you control with flying dies, return another target creature card with lesser mana value from your graveyard to the battlefield.

As an additional cost to cast this spell, you may reveal a Dragon card from your hand. Defender, flying When this creature enters, if you revealed a Dragon card or controlled a Dragon as you cast this spell, draw a card.

Defender (This creature can't attack.) When this creature dies, create a 3/3 white Bird creature token with flying.

As an additional cost to cast this spell, sacrifice a creature. Draw two cards.

As an additional cost to cast this spell, sacrifice an artifact or creature. Draw two cards and create a Treasure token. (It's an artifact with "{T}, Sacrifice this token: Add one mana of any color.")

({T}: Add {W}.)

Exile target creature you control, then return that card to the battlefield under its owner's control. Draw a card.

Draw a card for each Bird on the battlefield.

Flying When this creature enters, scry 3. (Look at the top three cards of your library, then put any number of them on the bottom and the rest on top in any order.)

Create two 1/1 white Bird creature tokens with flying. Flashback—Tap three untapped white creatures you control. (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Exile target creature you control, then return that card to the battlefield under its owner's control. Draw a card.

Flying Landfall — Whenever a land you control enters, you may create a 1/1 white Bird creature token with flying.

Exile target creature you control, then return it to the battlefield under its owner's control. Rebound (If you cast this spell from your hand, exile it as it resolves. At the beginning of your next upkeep, you may cast this card from exile without paying its mana cost.)

Until end of turn, target creature gets +2/+0 and gains "When this creature dies, return it to the battlefield tapped under its owner's control and you create a Treasure token." (It's an artifact with "{T}, Sacrifice this token: Add one mana of any color.")

At the beginning of your end step, if one or more creatures died this turn, you gain that much life and distribute that many +1/+1 counters among creatures you control.

This spell costs {2} less to cast as long as you've drawn two or more cards this turn. Flying, vigilance Other Birds you control have vigilance.

Flying Whenever this creature deals combat damage to a player, you may sacrifice it. If you do, draw three cards.

({T}: Add {U}.)

Flying Whenever one or more Birds you control deal combat damage to a player, choose one — • You may put a Bird creature card from your hand or graveyard onto the battlefield with a finality counter on it. • Put a +1/+1 counter on each Bird you control. • Draw a card.

Flying {T}, Tap two untapped Birds you control: Return target permanent to its owner's hand.

Flying Whenever another creature you control enters, you gain 1 life.

Defender, flying Morph {U} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)

Whenever you cast an instant or sorcery spell, create a 1/1 blue Bird Illusion creature token with flying.

Flying At the beginning of combat on your turn, populate. (Create a token that's a copy of a creature token you control.) Whenever a creature token you control enters, put a +1/+1 counter on this creature.

Flying Whenever this creature or another creature you control with flying enters, put a +1/+1 counter on target creature you control without flying.

Until end of turn, target creature gets +1/+0 and gains lifelink and "When this creature dies, return it to the battlefield tapped under its owner's control."

{T}: Add {C}. {W}{U}, {T}, Sacrifice a Bird: Draw a card.

Flying, double strike, vigilance

Flying When this creature enters, you may search your library for up to three cards named Squadron Hawk, reveal them, put them into your hand, then shuffle.

Flying Whenever this creature deals combat damage to a player, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)