Elderwood Ancient

Empower (Whenever this creature attacks with two
or more other creatures, put a +1/+1 counter on it. It
becomes empowered for the rest of the game if it is not
already empowered.)
As long as this creature is Empowered, it assigns
combat damage equal to its toughness rather than
its power.
Other Empowered creatures you control get
+1/+1 and have forestwalk.