Rivina Saul, Worldwalker

+2: Untap up to three basic lands.
+1: Until end of turn, Nivina Saul, Worldwalker becomes a legendary 4/4 green Centaur creature with lifelink, indestructible, and trample.
-7: Search your library for up to X basic lands and put them onto the battlefield tapped, where X is the number of lands you control.