Sakashima the Impostor + Opalescence + Detention Sphere

Prerequisites

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Steps

1. 1Cast Sakashima the Impostor by paying , having it enter the battlefield as a copy of Detention Sphere that is a 3/3 legendary enchantment creature named Sakishima the Imposter.
2. 2When Sakashima the Impostor, it triggers its first ability from Detention Sphere, exiling itself.
3. 3Sakashima the Impostor leaves the battlefield, triggering its second ability from Detention Sphere, returning itself to the battlefield as a copy of Detention Sphere that is a 3/3 legendary creature named Sakashima the Impostor.
4. 4Repeat from step 2 any number of times.
5. 5End the loop by choosing a different creature to copy or a different permanent to exile, or by declining to exile anything.

Effects

• Infinite creature ETB
• Infinite creature LTB