It's where you play your deck normally, but you pretend your opponent just does nothing. He starts at 20 life. When you kill your opponent, however many turns have passed is what the deck "goldfishes"
You can find the definition of this and many other Magic-related terms in the Magic Player's Dictionary, stickied at the top of Magic General. Please post any terminology-related questions there. Thread closed.
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"...because without beer, things do not seem to go as well."
A deck's goldfish, then, is the turn it wins (on average) when goldfishing.
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How Creatures Die
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