They both attack together, only 2 attack phases. If one swings first then the other, 3 attack phases. it all depends on how you swing and order. It says "when they attack for the first time this turn". Aurelia can swing first, then you get another attack phase, then Scourge and Aurelia(Only Scourge triggers), then another attack phase, then both swing again and thats it.
April 4, 2016 10:22 p.m.
@ThereIsNoGodOnlyJace: That's incorrect.
If both creatures attack, assuming the opponent you're attacking has more life than you, you'll get two additional combat phases. It doesn't matter whether both creatures attack in your original combat phase or not. Each one has a triggered ability that will generate a new combat phase. Whenever multiple extra steps, phases, or turns are generated, they're all taken in the reverse of the order in which they were created.
April 4, 2016 10:26 p.m.
I Apologize, i believed that when they both created an additional combat phase, it would only make one additional phase since it occured in the first attack phase. I understand now.