The Immortal Writhe

Trample
The Immortal Writhe's power and toughness are
each equal to the number of card types in all graveyards plus 1.
At the beginning of each player's upkeep, that
player puts the top card of their library into their graveyard.
During each player's turn, you may cast up to
one card from that player's graveyard. If you cast
an instant or sorcery in this way, then exile it.