Suth'gur, Mourner's Call

Flying
As Suth'gur enters the battlefield, exile a creature
card from your graveyard. Suth'gur's power and toughness are equal to the exiled creatures' power
and toughness. Suth'gur, gains all abilities of the creature exiled this way.
Whenever Suth'gur attacks, you may pay {b}{g}{r}. If you do, return target Dragon creature
card from your graveyard to the battlefield tapped
and attacking. Put a +1/+1 counter on it