Darksteel Pendant

Scry was new technology when this printed, and bolting it onto an indestructible body tells you exactly what kind of engine the card wants to be: a smoothing rock that survives the sweepers the grindy deck running it expects to play through. Repeatable filtering at one mana per activation was, in that era, a meaningful rate; the card asks for nothing beyond the two to deploy it and a spare mana to fix your next draw whenever you can afford one. The ability carries no timing restriction, so you can hold the mana up and filter when the rest of your turn is spent rather than committing it on the main phase, improving your draw without telegraphing the play. Indestructible reads more as flavor than function here, since few opponents bother pointing removal at a do-nothing artifact, but it does mean the engine never gets swept up by destruction effects aimed elsewhere. The real tension is patience versus tempo: every activation is a mana not spent on the board, which makes this a tool for the attrition deck that wins on card quality rather than speed. It scries one, not two, and never threatens to run away with a game; it just quietly improves draw steps you can afford to pay for. A modest, honest piece of filtering whose ceiling sits close to its floor.