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The trick is in the untap clause, which quietly rewrites the card's true cost. Paying three mana to filter your hand would be merely fine; untapping three lands hands that mana right back, so the spell is mana-neutral even as it cycles two cards through your hand at instant speed. Pair it with lands that tap for more than one mana and the ledger tips positive, but on its own the point is that the loot comes for free. That is exactly why it became a workhorse of high-speed combo: it digs toward a missing piece on an opponent's end step or in response to something on the stack, and the recovered mana feeds whatever comes next. The looting is the real engine, not a tax. Drawing first, then choosing two cards to pitch, means you decide exactly what stays and what goes to the bin, so flashback spells, dredge cards, and reanimation targets reach the yard by your own selection while the card flow continues. The honest cost is that it is card disadvantage in raw count: you spend the spell, draw two, discard two, and end down a card in hand. A focused deck pays that toll gladly because the discard is a destination rather than a loss; a generic deck just bleeds a card to dig. It is the rare filter whose mana price disappears once your manabase and graveyard are arranged to want it.