Hydra

Hydra enters the battlefield with 3 heads. Hydra's
power and toughness are multiplied by the current amount of heads Hydra has. If Hydra takes enough damage to lose a head, but not enough to die it
grows 2 more at the beginning of your upkeep.
It can block as many attacking creatures as it has
heads. Adding +3/+3 adds a head to Hydra.
I kept chopping, and chopping, but that damn beast kept
coming back. Stronger, scarier, and with more heads.