Gogeta SSJ4, Strongest Fusion

At the beginning of each opponent's upkeep,
you manifest the top card of that player's library. (Put it onto the battlefield face down
as a 2/2 creature. Turn it face up any time for
its mana cost if it's a creature card.)

Whenever a creature you control but don't
own dies, its owner loses 2 life and you gain
2 life.