Selena, Flameheart Primordial

At the beginning of your end step, if you cast
three or more Elemental spells this turn, you
may search your library for a land card, put it
onto the battlefield tapped, then shuffle your
library.
Elemental creatures you control have hexproof
and "Whenever this creature deals combat
damage to a player, you may have it deal damage
equal to its power to target creature that player controls."