Blasphemous Act

Sorcery    (CMC:9)

This spell costs less to cast for each creature on the battlefield. Blasphemous Act deals 13 damage to each creature.

661 CMR • ENDaarken

™ & © 1993— Wizards of the Coast

Notes: TODO: Update Copyright

Legal in: Modern,Innistrad Block,Legacy,Vintage,Freeform,Prismatic,Tribal Wars Legacy,Tribal Wars Standard,Singleton 100,Commander

Oracle Text (click to copy):

Blasphemous Act {8}{R} Sorcery Blasphemous Act costs {1} less to cast for each creature on the battlefield. Blasphemous Act deals 13 damage to each creature.

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View this MTG card on Gatherer

9/22/2011
The total cost to cast Blasphemous Act is locked in before you pay that cost. For example, if there are three creatures on the battlefield, including one you can sacrifice to add  to your mana pool, the total cost of Blasphemous Act is . Then you can sacrifice the creature when you activate mana abilities just before paying the cost.
9/22/2011
Blasphemous Act's ability can't reduce the total cost to cast the spell below .
9/22/2011
Although players may respond to Blasphemous Act once it's been cast, once it's announced, they can't respond before the cost is calculated and paid.

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Card Blasphemous Act is not on TCGPlayer.