Arachnus Spinner

Most tutors fetch a creature, a land, or an answer to whatever the opponent just did. This one fetches a piece of removal that is also a leash: Arachnus Web, an Aura that taps down the creature it's attached to and keeps it from untapping. The Spinner is the engine that makes that Aura repeatable, and the design knot it ties is worth pulling apart. The fetch costs no mana; the price is paid in bodies, because every activation taps an untapped Spider you control, the Spinner included. So the card scales with a board of arachnids: one Spider locks down one threat, a swarm shuts off a wing of an attack. Pulling the Web from the graveyard as well as the library is the quiet half of the design: once an enchanted creature dies or the Web is destroyed, you can rebuild the lock from your own bin, turning a one-shot Aura into a recurring tax on the opponent's best attacker. The 5/7 reach body is built to survive the ground stall this strategy creates, holding the fort while the Webs accumulate. It is a closed loop, a Spider-tribal package that asks you to commit to the type rather than splash it, and that commitment is exactly what the no-mana activation is balanced against.