Inspired -- Whenever Aerie Worshippers becomes untapped, you may pay {2}{U}. If you do, create a 2/2 blue Bird enchantment creature token with flying.

Defender (This creature can't attack.)

Flying

When Ageless Sentinels blocks, it becomes a Bird Giant, and it loses defender. (It's no longer a Wall. This effect lasts indefinitely.)

Draw a card for each Bird on the battlefield.

{T}: Add {C}.

{2}, {T}: Put a +1/+1 counter on target Bird, Cat, Dog, Goat, Ox, or Snake.

Flying

Other Bird creatures get +1/+1.

Other Soldier creatures get +1/+1.

{T}: Add {W} or {U}.

{W}{U}: Azorius Keyrune becomes a 2/2 white and blue Bird artifact creature with flying until end of turn.

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.)

Whenever a creature enters the battlefield this turn, you may draw a card.

Fuse (You may cast one or both halves of this card from your hand.)

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Create four 1/1 white Bird creature tokens with flying.

Fuse (You may cast one or both halves of this card from your hand.)

Flying

When Celestial Gatekeeper dies, exile it, then return up to two target Bird and/or Cleric permanent cards from your graveyard to the battlefield.

Flying

Tap two untapped Birds you control: Draw a card.

Tap two untapped Wizards you control: Target creature gains flying until end of turn.

Flying

Whenever Derevi, Empyrial Tactician enters the battlefield or a creature you control deals combat damage to a player, you may tap or untap target permanent.

{1}{G}{W}{U}: Put Derevi onto the battlefield from the command zone.

({W/U} can be paid with either {W} or {U}.)

Whenever a player casts a noncreature spell, counter that spell. That player creates X 1/1 white and blue Bird creature tokens with flying, where X is the spell's mana value.

Flying

Landfall -- Whenever a land enters the battlefield under your control, you may create a 1/1 white Bird creature token with flying.

Whenever Falconer Adept attacks, create a 1/1 white Bird creature token with flying that's tapped and attacking.

Create X 1/1 white Bird Soldier creature tokens with flying, where X is the number of attacking creatures.

Cumulative upkeep {W} or {U} (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)

When Jötun Owl Keeper dies, create a 1/1 white Bird creature token with flying for each age counter on it.

Kicker {X}{2} (You may pay an additional {X}{2} as you cast this spell.)

Flying

When Kangee, Aerie Keeper enters the battlefield, if it was kicked, put X feather counters on it.

Other Bird creatures get +1/+1 for each feather counter on Kangee, Aerie Keeper.

Flying

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

Create four 1/1 white Bird creature tokens with flying.

Basic landcycling {2} ({2}, Discard this card: Search your library for a basic land card, reveal it, put it into your hand, then shuffle.)

+2: Until your next turn, up to one target creature gets -2/-0 and loses flying.

-3: Create a 4/4 blue Elemental Bird creature token with flying.

-8: You get an emblem with "Islands you control have '{T}: Draw a card.'"

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

Defender (This creature can't attack.)

When Roc Egg dies, create a 3/3 white Bird creature token with flying.

Bird creatures get +1/+1.

{1}{W}: Target Bird creature gains banding until end of turn. (Any creatures with banding, and up to one without, can attack in a band. Bands are blocked as a group. If any creatures with banding a player controls are blocking or being blocked by a creature, that player divides that creature's combat damage, not its controller, among any of the creatures it's being blocked by or is blocking.)

Whenever a Bird is put into your graveyard from the battlefield, put a feather counter on Soulcatchers' Aerie.

Bird creatures get +1/+1 for each feather counter on Soulcatchers' Aerie.

Flying

Raid -- When Wingmate Roc enters the battlefield, if you attacked this turn, create a 3/4 white Bird creature token with flying.

Whenever Wingmate Roc attacks, you gain 1 life for each attacking creature.