Ragnarok

Indestructible, Trample
Ragnarok cannot attack or block unless there 20
or more cards in an opponents graveyard
Whenever Ragnarok deals combat damage to a player, that player loses the game
At the beginning of each player's upkeep, that player sacrifices a creature, a land, and an artifact or enchantment. If they cannot, Ragnarok deals 5 damage to that player and 3 damage to each creature controls
Pure, utter destruction given form