Wand of the Worldsoul

Convoke is normally a keyword baked into a spell at printing, a static property that lives on Chord of Calling or an Overrun-style finisher. Here it is peeled off and handed out as an activated ability, which is the whole trick: you decide, on any turn you have mana to spare, that your next spell will let creatures tap toward its cost. That flexibility comes with two brakes. The artifact enters tapped, so the turn it arrives it sits idle; you have to reach your next turn before either line comes online. And once online, both abilities share a single tap, so producing the white mana and granting convoke cannot happen on the same turn. Each turn you choose: a mana rock that adds one white, or an enabler that discounts one large spell by turning your board into payment. The convoke it grants also lasts only for the next spell you cast that turn, so it rewards building a wide board and holding it for a single payoff cast rather than dribbling creatures out freely. It belongs to the family of tools that let a stalled-but-wide position buy back into a big turn, but it earns its slot on the second ability rather than the first. The mana line is a rate; the convoke line is a plan.