Titania, Nature's Force is a mythic Legendary Creature — Elemental card from Duskmourn: House of Horror Commander (DSC), collector number 202. Current market price: $0.83, TCGplayer market prices via Scryfall.
You may play Forests from your graveyard. Whenever a Forest you control enters, create a 5/3 green Elemental creature token. Whenever an Elemental you control dies, you may mill three cards.