Trusty Boomerang

Most Equipment is built to stay strapped on: the equip cost is a one-time toll, and everything after is durable value that compounds while the buff sits still. This one inverts the premise by baking a self-bounce into the ability it grants. Activate the tap and the boomerang flies back to your hand, which means the full cycle costs you both a fresh casting of the artifact and its equip cost again before you can pull the trigger a second time. That two-step reset is what keeps a repeatable tapper in check: you get a Frost Titan-style lockdown distributed across a turn cycle, but only if you keep feeding it mana, a cast, and an equip turn after turn. The tap can be aimed at anything: an incoming attacker, a would-be blocker, a mana dork you want to keep off the board. The return-to-hand is not a downside you are forced to eat; it is the price of firing, and you are free to leave the boomerang parked on a creature indefinitely as a latent threat until the mana and the target line up. Because it comes home after every use, it is never a dead artifact stranded on the field, but it is also never free: each activation quietly relaunders itself back into your hand and demands the full toll to redeploy. The result behaves more like a rebuyable trick than a static buff. Flavor and function agree: a weapon that comes home should not stay in anyone's hand for long.