Emerald Ash Borer

Invade Forest
When a Forest is put into a graveyard from the battlefield, put a +1/+1 counter on Emerald Ash
Borer. This ability only triggers once each turn.
{g}{w}{u}: Target land becomes a Forest. This
ability costs {2} more to activate for each Forest
that land's controller controls and each land card
in that player's graveyard.