Oppo pays 3 cost for Metallic Rebuke w 1 treasure
I countered their removal spell (Burning Hands) with Metallic Rebuke.
They must pay 3, but they were tapped out and had a single treasure in play. Somehow they sacrificed the treasure and paid the entire cost with it.
They had two creatures - Immersturm Predator and a tapped mana dork. Only other permanent on their side was Witch's Oven. So no relevant other effects that change costs or make treasure sacrifice for more mana.
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