Doomsday Excruciator + Invasion of Amonkhet Bug
When doomsday excruciator enters via invasion of amonkhet, its mill ability triggers. However, Doomsday Excruciator specifically says "if it was cast." Invasion of Amonkhet's ability does not qualify as 'casting', and so this is a bug.
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BluntBSE#73182
shared this idea
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Rezzahan#77802
commented
The backside of the Invasion IS cast, so the copy of Doomsday Excruciator it becomes has been cast, thus it triggers. The cost for casting the backside is "free", but it is still being cast, and could potentially be countered, too.