Warden of the Grove

At the beginning of your end step, put a +1/+1 counter on target Beast creature you control.

Whenever a token you control enters, put a +1/+1 counter on this creature.

Whenever this creature attacks, another target attacking creature gets +X/+X until end of turn, where X is this creature's power.

At the beginning of combat on your turn, put X +1/+1 counters on each creature you control, where X is this creature's power.

Grakmaw 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.

At the beginning of combat on your turn, put a number of +1/+1 counters equal to Maester Seymour's power on another target creature you control.

: Monstrosity X, where X is the number of counters among creatures you control. (If this creature isn't monstrous, put X +1/+1 counters on it and it becomes monstrous.)

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)

This creature enters with a +1/+1 counter on it.

Landfall — Whenever a land you control enters, double the number of +1/+1 counters on this creature.