Gyrus, Waker of Corpses

Gyrus, Waker of Corpses enters the battlefield
with a number of +1/+1 counters on it equal to
the amount of mana spent to cast it.
Whenever Gyrus attacks, you may exile target
creature card with lesser power from your
graveyard. If you do, create a token that’s
a copy of that card and that’s tapped and
attacking. Exile the token at end of combat.