Sephiroth, Didn't Trigger
Sephrioth did not trigger when sacrificing creatures. I believe it is an interaction with crystalline barricade. This cost me a ranked match
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vote
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Rezzahan#77802
commented
Yes, it was the Crystal Barricade. And no, this is not a bug. The Barricade grants its controller hexproof, and Sephiroth's trigger has to TARGET the opponent. So there is no legal target to choose, and the trigger is removed from the stack right away.