Gyrnon, Necropolis Tyrant

Haste
Gyrnon, Necropolis Tyrant enters the battlefield
with a number of +1/+1 counters on it equal to
the number of creature cards in all graveyards.
Whenever Gyrnon attacks, put a creature card
with lesser power from a graveyard onto the
battlefield under your control tapped and
attacking. Sacrifice it at the beginning of the
next end step.