Darksteel Reactor and Vorel

[Pleeb]

This is the part of the rule I'm interpreting as you, being the only player making an active choice, have to break the loop.

" If that happens, the active player (or, if the active player is not involved in the loop, the first player in turn order who is involved) must then make a different game choice so the loop does not continue."

[Anoobass]

Just smash my hopes and dreams why don't you...

[Avodroc13]

When I win is on the stack, can I Stifie the i win then while Stifie is on the stack cast an exile target artifact, let Stifie resolve, and be safe?

[Pleeb]

When I win is on the stack, can I Stifie the i win then while Stifie is on the stack cast an exile target artifact, let Stifie resolve, and be safe?

My understanding is that when the I win resolves, it checks to see if there are still 20 counters on the artifact. This means that you can exile the artifact or remove enough counters from the artifact to get it below 20 while it is on the stack and it will be countered, no stifle needed. I'm not 100% on this one though.