Tainira, Tideshaper Sovereign

Whenever a creature you control explores, you may return a land you control to its owner's hand. If you do, you may play an additional land this turn.
Whenever a land card is revealed during an explore effect, you may put that card onto the battlefield tapped.

{g}{u}, {t}: Target land you control becomes a 3/3 green
and blue Elemental creature with hexproof and haste until end of turn. It’s still a land.

"The tides obey her whisper, and the land itself bows to
her call."