Ideally you want to win the same turn that you cast Samut, which means you need to Start Your Engines good and early for his cost reduction, ramp hard, and have some non-trivial removal so you survive the early game
If you have a bunch of creatures and your opponent is attacking, swarming them with a pack of Moogles sounds pretty funny to me, kupo
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Once your end step begins, it's too late to cause creatures your opponents control to die in order to cause this ability to trigger
His Adoring Fans ability seals the deal by providing an excellent way to get more cards on the board
This is partly why discard decks are so strong against Ruby/Amethyst right now