Gravewrought Hydra

You can't spend mana on {x}.
Deathtouch, delve (Each card you exile from your graveyard
while casting this spell pays for {1}.)
Gravewrought Hydra enters the battlefield with
X +1/+1 counters on it.
Exile two creature cards from graveyards: Put a
+1/+1 counter on Gravewrought Hydra.