Venom-Gorged Hydra

{b}{b}: Monstrosity 5 (If this permanent isn't monstrous, put 5 +1/+1 counters on it and it becomes monstrous.)
All +1/+1 counters on Venom-Gorged Hydra are instead counted as +0/+1.
As long as Venom-Gorged Hydra is monstrous, it has deathtouch and can block additional creatures equal to half the number of +1/+1 counters on it, rounded down.