Dex, Forest Treader

Landfall - Whenever a land you control enters the battlefield, place an Overgrowth counter on it. (It acts as a forest in addition to it's other land types)

Whenever Dex, Forest Treader, enters the battlefield or attacks, place an Overgrowth counter on one land without an overgrowth counter.

Partner with Folius, Spirit of the Wilds