Compose the Strom

Deal X damage to X target creatures on the battlefield, where X is total number of Instant
and Sorcery cards on your graveyard.
Overcharge{1}{u}{r}: Deal X damage to any target.
(You may play this card from your graveyard for its
Overcharge cost with this Overcharge ability.
Then exile this card.)
"Storm is a symphony. And I am great conductor."
— Ral Zarek