Molara, the Raging Tempest

Elemental creatures you control have
trample and "Whenever this creature deals combat damage to a player, you may draw a card."
Whenever you cast an Elemental spell, you
may pay {r}{r}{r}. If you do, Molara, the
Raging Tempest deals damage equal to the number of Elemental creatures you control
to target creature or planeswalker.