Unclue, Undying Lich

Unclue, Undying Lich's power, and toughness
are equal to the number of cards in all player's graveyards.
If there are not at least 20 cards in all graveyards Unclue, Undying Lich is not a creature.
Whenever you draw a card, all players put the
top card of there library into the graveyard.