Cofar, Grove Wanderer

+2: Create a 1/1 root creature token with "at the beginning of your upkeep put a +1/+1 counter on this token"
-2: Target creature becomes a basic forest and loses all other abilities and types until the end of your next turn
-12: You get an emblem with "Whenever a creature or land you control would produce mana it produces twice as much of that mana instead"