Snake hydra

Deathtouch
Snake Hydra enters the battlefield with X +1/+1 counters on it.
Whenever this creature gets a +1/+1 counter added to it create a 1/1 green snake token with deathtouch.
{x}{x},{t} add X +1/+1 counters to this creature and create X 1/1 green snake tokens with deathtouch.