Selfless Spirit

Flying
Sacrifice Selfless Spirit: Creatures you control gain indestructible until end of turn.

Lingering Souls

Create two 1/1 white Spirit creature tokens with flying.
Flashback {1}{B} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Intangible Virtue

Creature tokens you control get +1/+1 and have vigilance.

Keening Apparition

Sacrifice Keening Apparition: Destroy target enchantment.

Niveous Wisps

Target creature becomes white until end of turn. Tap that creature.
Draw a card.

Angel of Flight Alabaster

Flying
At the beginning of your upkeep, return target Spirit card from your graveyard to your hand.

Niblis of the Urn

Flying
Whenever Niblis of the Urn attacks, you may tap target creature.

Spirit

Plains

Emissary of the Sleepless

Flying
When Emissary of the Sleepless enters, if a creature died this turn, create a 1/1 white Spirit creature token with flying.

Traveler's Amulet

{1}, Sacrifice Traveler's Amulet: Search your library for a basic land card, reveal it, put it into your hand, then shuffle.

Topplegeist

Flying
When Topplegeist enters, tap target creature an opponent controls.
Delirium — At the beginning of each opponent's upkeep, if there are four or more card types among cards in your graveyard, tap target creature that player controls.

Bond of Discipline

Tap all creatures your opponents control. Creatures you control gain lifelink until end of turn.

Niblis of the Mist

Flying
When Niblis of the Mist enters, you may tap target creature.

Oust

Put target creature into its owner's library second from the top. Its controller gains 3 life.

Doomed Traveler

When Doomed Traveler dies, create a 1/1 white Spirit creature token with flying.

Requiem Angel

Flying
Whenever another non-Spirit creature you control dies, create a 1/1 white Spirit creature token with flying.

Brightmare

When Brightmare enters, tap up to one target creature. You gain life equal to that creature's power.

Windborn Muse

Flying
Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you.

Field of Souls

Whenever a nontoken creature is put into your graveyard from the battlefield, create a 1/1 white Spirit creature token with flying.