Scrap Hydra

Scrap Hydra enters the battlefield with
X +1/+1 counters on it.
When Scrap Hydra dies, create a 1/1 green
Head creature token for each +1/+1 counter
on it.
{x}, sacrifice X Head creatures: put X +1/+1 counters on it.
A deck can have any number of cards named Scrap Hydra.