Mana Leak

Counter target spell unless its controller pays {3}.

Drogskol Captain

Flying
Other Spirit creatures you control get +1/+1 and have hexproof. (They can't be the targets of spells or abilities your opponents control.)

Doomed Traveler

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

Hieroglyphic Illumination

Draw two cards.
Cycling {U} ({U}, Discard this card: Draw a card.)

Cancel

Geist of Saint Traft

Hexproof (This creature can't be the target of spells or abilities your opponents control.)
Whenever Geist of Saint Traft attacks, create a 4/4 white Angel creature token with flying that's tapped and attacking. Exile that token at end of combat.

Aether Adept

When this creature enters, return target creature to its owner's hand.

Azorius Chancery

This land enters tapped.
When this land enters, return a land you control to its owner's hand.
{T}: Add {W}{U}.

Island

Intangible Virtue

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

Peel from Reality

Return target creature you control and target creature you don't control to their owners' hands.

Think Twice

Draw a card.
Flashback {2}{U} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Court Hussar

Vigilance
When this creature enters, look at the top three cards of your library, then put one of them into your hand and the rest on the bottom of your library in any order.
When this creature enters, sacrifice it unless {W} was spent to cast it.

Azorius Guildgate

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

Inspiration

Plains

Midnight Haunting

Create two 1/1 white Spirit creature tokens with flying.

Mausoleum Guard

When this creature dies, create two 1/1 white Spirit creature tokens with flying.

Moorland Haunt

{T}: Add {C}.
{W}{U}, {T}, Exile a creature card from your graveyard: Create a 1/1 white Spirit creature token with flying.