Titania, Gaea Incarnate is a mythic Legendary Creature — Elemental Avatar card from The Brothers' War (BRO), collector number 256b.
Reach, vigilance, trample, haste Titania's power and toughness are each equal to the number of lands you control. When Titania enters, return all land cards from your graveyard to the battlefield tapped. {3}{G}: Put four +1/+1 counters on target land you control. It becomes a 0/0 Elemental creature with haste. It's still a land.