Yawgmoth's Will (Nicolas Labarre) [World Championship Decks 2000] 2010 Duelist Pack Collection Tin Scholars say that arbiters exist

Scholars say that arbiters exist on every world

When Thought-Knot Seer enters the battlefield

a visible form

while this card is in your GY: You can add this card to your hand

Set: XY: BREAKpoint Type: Grass Rarity: Holo Rare Retreat cost: Colorless

Yawgmoth's Will (Nicolas Labarre) [World Championship Decks 2000] 2010 Duelist Pack Collection Tin Scholars say that arbiters existSet: World Championship Decks 2000 Type: Sorcery Rarity: Rare Cost: {2}{B} Until end of turn, you may play lands and cast spells from your graveyard. If a card would be put into your graveyard from anywhere this turn, exile that card instead.