Galvanic Bombardment deals X damage to taret creature, where X is 2 plus the number of cards named Galvanic Bombardment in your graveyard.
Geist-powered devices have no shortage of fuel.
Illus. Terese Nielsen
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KHANS OF TARKIR 
COMMANDER 2014
FTV: ANNIHILATION 
SPEED vs CUNNING 
MAGIC 2015 
CONSPIRACY 
MORE SETS
