Fungus Elemental [Weatherlight]

Set: Weatherlight Type: Creature — Fungus Elemental Rarity: Rare Cost: {3}{G} {G}, Sacrifice a Forest: Put a +2/+2 counter on Fungus Elemental. Activate only if Fungus Elemental entered the battlefield this turn. I rot growth and grow rot. What am I? —Elvish riddle