The False Hydra, Forgotten

The False Hydra, Forgotten enters with X +1/+1 counters on it
Hexproof
When a creature leaves the battlefield, put a +1/+1 counter on this creature, gain 1 life, and create a 0/1 creature token named "Forgotten Citizen" with (Remove a +1/+1 counter from target creature you control, add {c}{c}{c}) ({t}, remove 2 +1/+1 counters from target creature you control, exile target creature untill your next main phase)