Apparently because the word used in Gratuitous Violence’s text is “creature”, not “creatureS”, so he said that means its effect has to be assigned to one creature.
Situation 1: I attacked my opponent with 3 creatures with power 4 each, and I had Gratuitous Violence out also. He had no blockers. So I thought this would mean he would take 24 damage. He says that I have to assign Gratuitous Violence to one creature only. So the damage will only be 16.
Situation 2: I have Gratuitous Violence out and I attacked my opponent with a 4/4 creature. He blocks with a 5/5. Do we both die or just me?
Situation 2: I have Gratuitous Violence out and I attacked my opponent with a 4/4 creature. He blocks with a 5/5. Do we both die or just me?