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.
If multiple lands enter the battlefield simultaneously, all of those lands are counted. For example, if you control six lands and two lands enter the battlefield at the same time, Tatyova’s ability will trigger twice.
9 Sept 2022
You may choose to target the land that entered the battlefield with Tatyova, Steward of Tides’s triggered ability.