"Soul Laboratory" (playtest)

Exile two creature cards from graveyards: Create
a token creature that is a copy of one of those
cards, except it has the power and toughness of
the other card. Activate this ability only once
each turn.
Unearth {2}{b}{g}{u} (Return this card from your
graveyard to the battlefield. Exile it at the beginning
of the next end step or if it would leave the battlefield.
Unearth only as a sorcery.)