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As near as I can tell through some Google searching, the Chaos Deck variant was being talked about online as early as 2004, though I suspect it was played offline much earlier than that

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If Golden-Tail Trainer's power changes after costs are locked in, or if Golden-Tail Trainer leaves the battlefield while you are activating mana abilities or paying those costs, the cost reduction effect won't be affected and the total cost to cast the spell won't change

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