Dreadful Hydra

Dreadful Hydra enter the battlefield with X+1/+1 counter on it.
Delve (Each card you exile from your graveyard while casting this spell pays for {1}.)
{2}Remove a +1/+1 counter from Dreadful Hydra, put two +1/+1 counter on Dreadful Hydra and you lose 2 life.