The Ancient One [The Lost Caverns of Ixalan]

Set: The Lost Caverns of Ixalan Type: Legendary Creature — Spirit God Rarity: Mythic Cost: {U}{B} Descend 8 — The Ancient One can't attack or block unless there are eight or more permanent cards in your graveyard.{2}{U}{B}: Draw a card, then discard a card. When you discard a card this way, target player mills cards equal to its mana value.