Phasing out a Warped creature does not prevent the delayed Warp trigger from exiling the creature

I warped a [[Quantum Riddler]] and phased it out with a [[March of Swirling Mist]], but the delayed trigger from Warp still sent my Riddler to the exile zone. The first time this happened was when the delayed trigger was on the stack, but I also replicated it in the second screenshot phasing out the Riddler before the delayed trigger occurred, but the delayed trigger still happened and exiled the Riddler.

Reproduce the report with Quantum Riddler, Warp, and March of Swirling Mist, checking both phasing timings described in the issue. Trace the Warp delayed-trigger and phasing behavior in the game engine, then add a regression test showing that a phased creature is not exiled by the delayed trigger; done means both reported cases leave the creature phased rather than exiling it.

Written by the indexing model from the issue text.