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Track the cards you're hunting and the cards you own. Prices log themselves — the nightly engine covers tracked cards, and opening any other card auto-logs the live ask median (always labeled asks, never solds). The Vault builds your candle charts, flags cards that hit your buy zone, and runs the stats on every card. The chart doesn't lie: green candle means more buyers than sellers.
Supply: engine-linked cards show supply — how many verified listings the engine counted last night, and how that count has moved over 30 days. Almost every card site shows you a price and never tells you how many are for sale. This is a count of what's listed, nothing more: not a price, not a sold figure, and not a buy signal. We're publishing the number because it's real and hard to get; we'll tell you what it predicts when we've measured it and graded it on the Track Record, not before.