Soulcatchers' Aerie

Whenever a Bird is put into your graveyard from the battlefield, put a feather counter on this enchantment.
Bird creatures get +1/+1 for each feather counter on this enchantment.

Island

Counterspell

Plains

Baleful Strix

Flying, deathtouch
When this creature enters, draw a card.

Battlefield Raptor

Didn't Say Please

Counter target spell. Its controller mills three cards.

Clear the Mind

Target player shuffles their graveyard into their library.
Draw a card.

Obelisk of Esper

Seaside Haven

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

Arcane Sanctum

This land enters tapped.
{T}: Add {W}, {U}, or {B}.

Tidehollow Strix

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

Swamp

Jubilant Skybonder

Flying
Creatures you control with flying have "Spells your opponents cast that target this creature cost {2} more to cast."

Diabolic Tutor

Search your library for a card, put that card into your hand, then shuffle.

Healer's Hawk

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