Activate Mairsil using Nevinyrral's Disk's ability by paying ({1} magic symbol) and tapping it.
Holding priority, activate Mairsil using Aetherling's first ability by paying ({U} magic symbol) , exiling it and returning it to the battlefield at beginning of the next end step.
Resolve the Nevinyrral's Disk's ability, destroying all artifacts, creatures, and enchantments.
Repeat.
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Results
Destroy all creatures, artifacts and enchantments on each player's turn.