Volcanic Salvo 


Sorcery
This spell costs {X} less to cast, where X is the total power of creatures you control.
Volcanic Salvo deals 6 damage to each of up to two target creatures and/or planeswalkers.
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Cards that do something similar expected a card that isn't here?
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Ghalta, Primal Hunger 100%
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"This spell costs {X} less to cast, where X is the total power of creatures you control."
The Pride of Hull Clade 91%
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"This spell costs {X} less to cast, where X is the total toughness of creatures you control."
Molten Monstrosity 88%
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"This spell costs {X} less to cast, where X is the greatest power among creatures you control."
The Great Henge 88%
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"This spell costs {X} less to cast, where X is the greatest power among creatures you control."
Spectral Denial 88%
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"This spell costs {1} less to cast for each creature you control with power 4 or greater."
Temur Battlecrier 83%
$0.95#2388
"During your turn, spells you cast cost {1} less to cast for each creature you control with power 4 or greater."
Orysa, Tide Choreographer 81%
$0.19#19678
"This spell costs {3} less to cast if creatures you control have total toughness 10 or greater."
Arwen's Gift 81%
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"This spell costs {1} less to cast if you control two or more legendary creatures."