Tralsorak Hydra

Tralsorak Hydra enters the battlefield with X
+1/+1 counters on it.
Whenever Tralsorak Hydra becomes blocked,
put a +1/+1 counter on it.
At the beginning of your upkeep, double the
number of counters on Tralsorak Hydra.
"Our mighty Titan has come to scatter the meek!"
- Tristern