Gyrus, Waker of Corpses
{X}{B}{R}{G}
Legendary Creature -- Hydra
0/0
~this~ enters with a number of +1/+1 counters on it equal to the amount of mana spent to cast it.
Whenever ~this~ 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.