A-Excavation Explosion

Removal that pays you back is an old idea, but the currency here is what tilts the trade in the caster's favor: kill something worth killing, and you walk away holding a Powerstone. Four damage at instant speed handles most creatures and every planeswalker that matters, and the token arrives tapped, so the mana doesn't come online until the following turn. That delay is the balancing line. You spend the mana now to answer a problem, and next turn you are effectively up a colorless source, one that can pay for any activated cost, any triggered ability, any non-spell obligation, and any artifact spell you like, while quietly refusing to hard-cast a bomb in another color. That single restriction is the whole texture of the Powerstone as a design: it accelerates you toward the artifact-heavy game plan a deck running this effect probably already wanted, without doubling as generic ramp. Most burn-plus-value removal buries the upside behind a condition on the fallout (a creature dying, a card drawn, life gained). This one folds the reward into resolution instead: the token is minted as the spell resolves, which means the whole package is only as reliable as the target. Let the creature or planeswalker slip out of range before resolution (a blink, a bounce, a sacrifice), and the spell fizzles and the Powerstone never appears. The upside rides entirely on the removal landing, and the tapped clause keeps it honest from there.