Geth, Lord of the Vault
Scars of Mirrodin — Mythic
Legendary Creature — Phyrexian Zombie
Geth, Lord of the Vault rulings:
2020-08-07: If a card in a player's graveyard has in its mana cost, X is considered to be 0.
2020-08-07: The target card must have mana value exactly X. You can't overpay to have the player mill more cards.
2020-08-07: In a multiplayer game, if a player leaves the game, all cards that player owns leave as well. If you leave the game, any spells and/or permanents you control from Geth's last ability are exiled.