Prismatic Strands

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.)

Battle Screech

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.)

Mystic Penitent

Vigilance
Threshold — As long as there are seven or more cards in your graveyard, this creature gets +1/+1 and has flying.

Shieldmage Advocate

{T}: Return target card from an opponent's graveyard to their hand. Prevent all damage that would be dealt to any target this turn by a source of your choice.

Patrol Hound

Discard a card: This creature gains first strike until end of turn.

Tireless Tribe

Discard a card: This creature gets +0/+4 until end of turn.

Spurnmage Advocate

{T}: Return two target cards from an opponent's graveyard to their hand. Destroy target attacking creature.

Plains

Guided Strike

Target creature gets +1/+0 and gains first strike until end of turn.
Draw a card.

Embolden

Prevent the next 4 damage that would be dealt this turn to any number of targets, divided as you choose.
Flashback {1}{W} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Benevolent Bodyguard

Sacrifice this creature: Target creature you control gains protection from the color of your choice until end of turn.

Nomad Decoy

{W}, {T}: Tap target creature.
Threshold — {W}{W}, {T}: Tap two target creatures. Activate only if there are seven or more cards in your graveyard.

Valor

First strike
As long as this card is in your graveyard and you control a Plains, creatures you control have first strike.

Shelter

Target creature you control gains protection from the color of your choice until end of turn.
Draw a card.

Militant Monk

Vigilance
{T}: Prevent the next 1 damage that would be dealt to any target this turn.

Suntail Hawk

Commander Eesha

Unquestioned Authority

Enchant creature
When this Aura enters, draw a card.
Enchanted creature has protection from creatures.

Dedicated Martyr

{W}, Sacrifice this creature: You gain 3 life.

Selfless Exorcist

{T}: Exile target creature card from a graveyard. That card deals damage equal to its power to this creature.

Beloved Chaplain

Aven Cloudchaser

Flying (This creature can't be blocked except by creatures with flying or reach.)
When this creature enters, destroy target enchantment.