Hellfire Tempest

Target player loses 1 life for each creature and planeswalker card in their graveyard.
Overload {1}{b} (You may cast this spell for its
overload cost. If you do, change its text by replacing
all instances of 'target' with 'each'.)
Storm (When you cast this spell, copy it for each
spell cast before it this turn. You may choose new
targets for the copies.)