Collected company + Righteous Valkyrie
Opponent put two Righteous Valkyrie on the battlefield by playing Collected Company.
Bug: Opponent gains "9" life instead of 4, which would have been the right life gain. One of the creatures has to be on the battlefield yet to trigger "when another one enters the battlefield", so there can only be one lifegain. MTG Arena grants this twice
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Leech#82954
shared this idea
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[Deleted User] commented
Both creatures enter at the same time so they both see each other which trigger each other