Plains

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.

Spurnmage Advocate

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

Guided Strike

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

Patrol Hound

Discard a card: Patrol Hound gains first strike until end of turn.

Aven Cloudchaser

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

Valor

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

Mystic Penitent

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

Nomad Decoy

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

Dedicated Martyr

{W}, Sacrifice Dedicated Martyr: You gain 3 life.

Benevolent Bodyguard

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

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.)

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.

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.)

Unquestioned Authority

Enchant creature
When Unquestioned Authority enters, draw a card.
Enchanted creature has protection from creatures.

Tireless Tribe

Discard a card: Tireless Tribe gets +0/+4 until end of turn.

Selfless Exorcist

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

Commander Eesha

Beloved Chaplain

Suntail Hawk

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.)