Tatyova, Steward of Tides
From Dominaria United set
Tatyova, Steward of Tides
Legendary Creature — Merfolk Druid
3/3
Land creatures you control have flying.
Whenever a land you control enters, if you control seven or more lands, up to one target land you control becomes a 3/3 Elemental creature with haste. It's still a land.