Nehebkau the Guardian

Nehebkau the Guardian enters the battlefield
with a number of +1/+1 counters on it equal to
the amount of mana spent to cast it.
Whenever Nehebkau 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.