Lucky Clover

Cast Bonecrusher Giant's Stomp and it resolves once; cast it with this artifact online and it resolves twice, for the same mana, at new targets of your choosing. The copy trigger is keyed to the instant or sorcery half of an Adventure, so it turns a deck stuffed with cheap Adventures into a machine that spends every one twice: two Stomps, two Beanstalk Giant ramps, two rounds of Chop Down off Giant Killer, two trips to the sideboard through Fae of Wishes' Granted. The "choose new targets" clause is what elevates a doubled removal spell from redundancy to a genuine blowout, and because the trigger carries no once-per-turn limit, chaining Adventures in a single turn doubles each one in sequence. What pays for that power is how inert the artifact is alone: it does nothing until you have assembled a critical mass of Adventures, and it rewards only players who sequence the adventure half before the permanent side, since the copy exists at cast, before the creature ever touches the battlefield. It is a strange resident of the artifact slot, an enabler whose payoff scales precisely with how far you are willing to bend a deck around it, and the skill of the shell it anchors is exactly that discipline: treating every Adventure card as a spell first and a body second.