Lernaean Hydra

Menace
Lernaean Hydra enters the battlefield with {9} +1/+1 counters on it.
If damage would be dealt to Lernaean Hydra,
prevent that damage and remove that many
+1/+1 counters from it.
Whenever a +1/+1 counter is removed from
Lernaean Hydra, put two +1/+1 counters on it at
the beginning of the next end step unless
opponent pays {1}for every two counters.