Strider Harness

Granting haste is one of the few combat effects that pays off exactly once: a creature that already attacked does not care whether it has haste anymore, so an equipment built to grant it has to be cheap to move, not cheap to cast. That is the entire logic of the equip-for-one cost here. The body of the card sits idle the moment its haste turn is spent, which means the value lives in dropping a fresh closer next turn and shifting the harness onto it for a single mana, swinging immediately, and repeating that until the game is over. The +1/+1 is a small consolation that keeps the equipment from being dead weight once the haste no longer matters, but the design is a momentum engine: every newly cast creature becomes an attacker the turn it arrives, and the harness itself survives the board wipes its bodies do not. Being colorless, it offers that tempo to any deck willing to keep deploying threats. The structural ancestor is the haste-granter as a persistent permanent rather than a one-shot spell: where a hasty token only fires once, this redistributes the same haste turn after turn. It is not the cheapest haste-granter to cast (Lightning Greaves and Swiftfoot Boots beat it on that axis), but those carry protective riders; this one is built purely to solve summoning sickness on your finishers at the lowest possible recurring price.