Vaal Hazak, Effluvial Fiend

Flying, Trample, Deathtouch
Vaal Hazak, Effluvial Fiend costs {x} less to cast,
where X is the number of cards in your graveyard.
{t}: return target creature from your graveyard
to the battlefield. Vaal Hazak, Effluvial Fiend
gets -8/-0 until end of turn.
"Surprise!"