Mirage Mirror + Seam Rip

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Overview

If you activate Mirage Mirror to become a copy of Seam Rip, Mirage Mirror does not cause Seam Rip’s “When this enchantment enters …” ability to trigger, so Mirage Mirror will not exile anything as a result of that change [706.4]. An actual Seam Rip that exiled a permanent only keeps that permanent exiled until that specific Seam Rip leaves the battlefield; destroying a different Seam Rip does not return the exiled permanent.

The StackRules & CitationsDetails & Edge Cases

Step 1

You activate Mirage Mirror’s ability targeting a Seam Rip on the battlefield. Mirage Mirror becomes a copy of that Seam Rip until end of turn.

Step 2

Because Mirage Mirror changed to become a copy while it was already on the battlefield (it did not enter the battlefield as a copy), this change does not trigger any enters-the-battlefield triggered abilities printed on Seam Rip; see [706.4].

Step 3

Therefore Mirage Mirror does not create a new exile linked to Seam Rip’s 'When this enchantment enters…' ability; nothing is exiled by the Mirror as a result of becoming that copy.

Step 4

If there is a real Seam Rip that earlier entered and exiled a permanent, that exile is linked to the specific Seam Rip that performed the exile and will remain until that same Seam Rip leaves the battlefield.

Step 5

If a second Seam Rip (a different object) is destroyed, that does not cause exiles created by the first Seam Rip to end; only the Seam Rip that created a given exile leaving the battlefield ends that particular exile.

Resolution

Mirage Mirror becoming a copy of Seam Rip does not trigger Seam Rip’s enters-the-battlefield trigger, so the Mirror will not exile the other player’s Seam Rip or any other permanent as a result of becoming that copy [706.4]. If a real Seam Rip had exiled a permanent, only that specific Seam Rip’s leaving the battlefield causes the exiled permanent to return; destroying a second Seam Rip that did not do the exiling has no effect on the exile created by the first Seam Rip.