Darth Nihilus

Eminence—As long as Darth Nihilus is in the
command zone or on the battlefield, during your
turn you may sacrifice a creature you control to
make another creature you control unblockable
until end of turn.
Devour, reach, trample
Whenever you sacrifice a creature you may give
Darth Nihilus +1/+1 until the end of turn and
you may gain 1 life.