Vryko, the Lich

On your upkeep, if you do not control a
Death God creature, choose a Death God
you control. It becomes a 6/6 creature until
the beginning of your next turn.
As long as Vryko is a creature, players can't win
the game.
At the beginning of your postcombat main phase,
if Vryko is a creature, you may sacrifice another creature. If you do, search your library for an artifact and reveal it. Then shuffle your library
and place it on top.