Corwinnn, Squirrel King

When Corwinnn, Squirrel King enters the battlefield, put an acorn counter on target land.
It becomes a Forest in addition to its other types.
{2}{g}{g}: Target Squirrel creature you control
gets +1/+1, gains forestwalk and squirrellink
until end of turn. (Damage dealt by that creature
also causes you to create that many 1/1 green Squirrel creature tokens.)