Dr. Chickenstein

Deathtouch Trample
{10}{b}{g} Create Chickenstein's monster (It's a legendary creature, Chicken zombie with base
power and toughness 6/7 and, "Whenever
another creature dies, put a +1/+1 counter on
this creature")
{x}{u}{b},{t}: Return target creature with total
mana value X or less from your graveyard to the battlefield