Grakmaw, Skyclave Ravager

Grakmaw, Skyclave Ravager enters with three +1/+1 counters on it.
Whenever another creature you control dies, if it had a +1/+1 counter on it, put a +1/+1 counter on Grakmaw.
When Grakmaw dies, create an X/X black and green Hydra creature token, where X is the number of +1/+1 counters on Grakmaw.

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Grakmaw’s second ability puts just one +1/+1 counter on it, no matter how many counters the dying creature had.

If a creature with a +1/+1 counter on it dies after receiving too many -1/-1 counters, it dies at the same time that the counters are removed, and Grakmaw’s second ability triggers. Similarly, if Grakmaw dies after receiving too many -1/-1 counters, use the number of +1/+1 counters it had prior to receiving the -1/-1 counters to determine the value of X.