Re: Delayed Missile Reflection
I've generally done this as Reflect with Delayed Effect, as you proprose. It can be quite nasty when you save them all up.
Phase 3: Reflect, Delayed until 12.
Phase 6: Reflect again, still Delayed until 12.
Phase 9: Once again
Phase 12: Unleash all the attacks I've absorbed, all at once, at THAT GUY!