Cast Blasphemous Act by paying at most 8, dealing 13 damage to each creature.
Repercussion triggers for each creature dealt damage this way.
Resolve the first Repercussion trigger, dealing 13 damage to an opponent.
Repeat step 3 for each Repercussion trigger, ensuring to resolve all triggers that would damage your opponent(s) first.
This explosive finisher leverages Repercussion to turn a battlefield-clearing sweeper into a lethal burn spell directly targeting your opponents. By casting Blasphemous Act, you deal a massive 13 damage to every single creature in play simultaneously. Repercussion watches this carnage unfold, immediately translating every point of creature damage into a direct hit to that creature's controller's life total.