Think Tank
Long before surveil had a keyword name, this is the effect that keyword would later be reverse-engineered from. The ability printed on the card today (look at the top card, decide whether it goes to the graveyard) is a modern errata: the original printing spelled the same instructions out longhand, and when surveil arrived years later as a named mechanic, the oracle text was updated to match it. That makes it an artifact of an early graveyard-as-resource era, when filling the bin was the whole engine behind threshold and flashback. The free upkeep filter quietly does two jobs at once: it smooths your draws by ditching dead lands or spells you cannot cast, and it feeds the yard for cards that count or recur what dies there. You pay your three mana up front and then nothing further, so value accrues a card at a time across many turns rather than in a burst; the design is built to be durable, not explosive. It never advances your board and never replaces itself with a draw, which leaves the payoff entirely tied to the quality of the cards it shovels downstairs. The retroactive surveil rewrite is the more interesting story than the card's own play history: a one-off enchantment turned out to describe a mechanic Wizards would keep returning to, and the oracle update is the seam where the old longhand design and the named keyword meet.
