New commander question. What order do things happen if I retrace Waves of Aggression with Sevinne on the battlefield?
When you cast Waves of Aggression from your graveyard while you control Sevinne, Sevinne’s ability will trigger. When the trigger resolves, you’ll copy Waves of Aggression. It has no targets, so it’s just an exact copy of the original.
When the copy of Waves of Aggression resolves, it will untap all creatures that attacked this turn (if any). If it’s not your main phase, then the rest of the spell won’t have any effect since the remainder of its text is predicated on the current phase being a main phase. If it is your main phase, then an additional combat phase is created after the current main phase, followed by an extra main phase.
All players will then receive priority between the copy resolving and the original spell resolving.
When the original spell resolves, it will do the same things that the copy did, but all of your creatures that attacked will still be untapped unless they became tapped for other reasons in the interim. Another combat phase followed by another main phase are created after the current main phase, meaning that as a whole the current turn will have three combat phases and four main phases.
It’s important to remember that Waves of Aggression won’t untap your creatures again between the first and second extra combat step, so I hope some of them have vigilance.
