Crystal Shard

{3}, {T} or {U}, {T}: Return target creature to its owner's hand unless its controller pays {1}.

Equilibrium

Whenever you cast a creature spell, you may pay {1}. If you do, return target creature to its owner's hand.

Apothecary Geist

Flying
When Apothecary Geist enters the battlefield, if you control another Spirit, you gain 3 life.

Battleground Geist

Flying
Other Spirit creatures you control get +1/+0.

Ageless Guardian

Rattlechains

Flash
Flying
When Rattlechains enters the battlefield, target Spirit gains hexproof until end of turn.
You may cast Spirit spells as though they had flash.

Blinking Spirit

{0}: Return Blinking Spirit to its owner's hand.

Sunken Hope

At the beginning of each player's upkeep, that player returns a creature they control to its owner's hand.

Azorius Herald

Azorius Herald can't be blocked.
When Azorius Herald enters the battlefield, you gain 4 life.
When Azorius Herald enters the battlefield, sacrifice it unless {U} was spent to cast it.

Dream Stalker

When Dream Stalker enters the battlefield, return a permanent you control to its owner's hand.

Angelic Curator

Angelic Page

Flying
{T}: Target attacking or blocking creature gets +1/+1 until end of turn.

Cloudstone Curio

Whenever a nonartifact permanent enters the battlefield under your control, you may return another permanent you control that shares a permanent type with it to its owner's hand.

Benevolent Ancestor

Defender (This creature can't attack.)
{T}: Prevent the next 1 damage that would be dealt to any target this turn.