Mourner's Shield [Mirrodin] Phyrexian Rat you may exile a white

you may exile a white card from your hand rather than pay this spell's mana cost

Set: Commander 2021 Type: Legendary Creature — Human Cleric Rarity: Rare Cost: {2}{W} At the beginning of your end step

Nicol Bolas Type: Instant Rarity: Uncommon Cost: {R}{G}{W} Choose one —

Set: Oversize Cards Rarity: Rare When Balduvian Horde comes into play

you are bound to me

Mourner's Shield [Mirrodin] Phyrexian Rat you may exile a whiteSet: Mirrodin Type: Artifact Rarity: Uncommon Cost: {4} Imprint When Mourner's Shield enters the battlefield, you may exile target card from a graveyard. {2}, {T}: Prevent all damage that would be dealt this turn by a source of your choice that shares a color with the exiled card.