Mimor bug
At Momir event(mid week magic), when I put Umori, the Collector onto the battlefield, MTGA became unresponsive.
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ray-ga#12856
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UsernameDoesn'tMatter#61489
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Also happened to me. The ability didn't go on the stack, Arena just hung while resolving Momir's ability, after Umori came into play. There was no dialog to select a type. The game just timed me out eventually and chose Artifact for me, then skipped my attack because I'd timed out.