When Ageless Sentinels blocks, it becomes a Bird Giant, and it loses defender. (It's no longer a Wall. This effect lasts indefinitely.)
4 /
4
{3}{W}
Aven Cloudchaser
Creature - Bird Soldier
Flying (This creature can't be blocked except by creatures with flying or reach.)
When Aven Cloudchaser enters the battlefield, destroy target enchantment.
2 /
2
{3}{W}
Aven Cloudchaser
Creature - Bird Soldier
Flying (This creature can't be blocked except by creatures with flying or reach.)
When Aven Cloudchaser enters the battlefield, destroy target enchantment.
2 /
2
{1}{W}{U}
Aven Mimeomancer
Creature - Bird Wizard
Flying
At the beginning of your upkeep, you may put a feather counter on target creature. If you do, that creature has base power and toughness 3/1 and has flying for as long as it has a feather counter on it.
3 /
1
{1}{W}
Aven Squire
Creature - Bird Soldier
Flying
Exalted (Whenever a creature you control attacks alone, that creature gets +1/+1 until end of turn.)
1 /
1
{2}{W}{W}
Battle Screech
Sorcery
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.)
{U}
Brainstorm
Instant
Draw three cards, then put two cards from your hand on top of your library in any order.
{3}{W}{W}
Celestial Gatekeeper
Creature - Bird Cleric
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.
2 /
2
--
Coastal Tower
Land
Coastal Tower enters the battlefield tapped.
{T}: Add {W} or {U}.
{2}{W}{W}
Commander Eesha
Legendary Creature - Bird Soldier
Flying, protection from creatures
2 /
4
{U}{U}
Counterspell
Instant
Counter target spell.
{U}{U}
Counterspell
Instant
Counter target spell.
{5}{W}{W}
Dimensional Breach
Sorcery
Exile all permanents. For as long as any of those cards remain exiled, at the beginning of each player's upkeep, that player returns one of the exiled cards they own to the battlefield.
{1}{U}{U}
Equilibrium
Enchantment
Whenever you cast a creature spell, you may pay {1}. If you do, return target creature to its owner's hand.
{1}{U}
Favorable Winds
Enchantment
Creatures you control with flying get +1/+1.
--
Flood Plain
Land
Flood Plain enters the battlefield tapped.
{T}, Sacrifice Flood Plain: Search your library for a Plains or Island card, put it onto the battlefield, then shuffle.
{1}{U}
Fog Bank
Creature - Wall
Defender, flying
Prevent all combat damage that would be dealt to and dealt by Fog Bank.
0 /
2
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
{1}{U}
Mindshrieker
Creature - Spirit Bird
Flying
{2}: Target player mills a card. Mindshrieker gets +X/+X until end of turn, where X is the milled card's mana value.
1 /
1
{1}{U}
Mindshrieker
Creature - Spirit Bird
Flying
{2}: Target player mills a card. Mindshrieker gets +X/+X until end of turn, where X is the milled card's mana value.
1 /
1
{W}
Moment of Silence
Instant
Target player skips their next combat phase this turn.
{W}
Mother of Runes
Creature - Human Cleric
{T}: Target creature you control gains protection from the color of your choice until end of turn.
1 /
1
--
Plains
Basic Land - Plains
({T}: Add {W}.)
--
Plains
Basic Land - Plains
({T}: Add {W}.)
--
Plains
Basic Land - Plains
({T}: Add {W}.)
--
Plains
Basic Land - Plains
({T}: Add {W}.)
--
Plains
Basic Land - Plains
({T}: Add {W}.)
--
Plains
Basic Land - Plains
({T}: Add {W}.)
--
Plains
Basic Land - Plains
({T}: Add {W}.)
--
Plains
Basic Land - Plains
({T}: Add {W}.)
--
Plains
Basic Land - Plains
({T}: Add {W}.)
--
Plains
Basic Land - Plains
({T}: Add {W}.)
{2}{W}
Prismatic Strands
Instant
Prevent all damage that sources of the color of your choice would deal this turn.
Flashback--Tap an untapped white creature you control. (You may cast this card from your graveyard for its flashback cost. Then exile it.)
{1}{W}
Soulcatcher
Creature - Bird Soldier
Flying
Whenever a creature with flying dies, put a +1/+1 counter on Soulcatcher.
1 /
1
{1}{W}
Soulcatchers' Aerie
Enchantment
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.
{1}{U}
Spire Owl
Creature - Bird
Flying
When Spire Owl enters the battlefield, look at the top four cards of your library, then put them back in any order.
1 /
1
{1}{U}
Spire Owl
Creature - Bird
Flying
When Spire Owl enters the battlefield, look at the top four cards of your library, then put them back in any order.
1 /
1
{1}{U}
Spire Owl
Creature - Bird
Flying
When Spire Owl enters the battlefield, look at the top four cards of your library, then put them back in any order.
1 /
1
{1}{U}
Spire Owl
Creature - Bird
Flying
When Spire Owl enters the battlefield, look at the top four cards of your library, then put them back in any order.
1 /
1
{1}{U}
Stormscape Familiar
Creature - Bird
Flying
White spells and black spells you cast cost {1} less to cast.
1 /
1
{1}{U}
Stormscape Familiar
Creature - Bird
Flying
White spells and black spells you cast cost {1} less to cast.
1 /
1
{1}{W}
Sunscape Familiar
Creature - Wall
Defender (This creature can't attack.)
Green spells and blue spells you cast cost {1} less to cast.
0 /
3
{W}
Suntail Hawk
Creature - Bird
Flying
1 /
1
{W}
Suntail Hawk
Creature - Bird
Flying
1 /
1
{W}
Suntail Hawk
Creature - Bird
Flying
1 /
1
{W}
Suntail Hawk
Creature - Bird
Flying
1 /
1
{4}{U}
Switcheroo
Sorcery
Exchange control of two target creatures.
{3}{W}{U}
Teferi's Moat
Enchantment
As Teferi's Moat enters the battlefield, choose a color.
Creatures of the chosen color without flying can't attack you.
{2}{W}
Unquestioned Authority
Enchantment - Aura
Enchant creature
When Unquestioned Authority enters the battlefield, draw a card.
Enchanted creature has protection from creatures.
{2}{W}
Unquestioned Authority
Enchantment - Aura
Enchant creature
When Unquestioned Authority enters the battlefield, draw a card.
Enchanted creature has protection from creatures.
{2}{W}
Unquestioned Authority
Enchantment - Aura
Enchant creature
When Unquestioned Authority enters the battlefield, draw a card.