Artillery Blast

The tapped-creature clause is the whole balancing act, and it puts this squarely in the lineage of white removal that only fires under a condition: white gets to kill things it otherwise couldn't, but only after they've committed to attacking or been forced down by a tapper. Wait for the swing, then answer the creature that's now defenseless. The domain scaling turns the ceiling into a manabase question rather than a mana-cost question: in a mono-white shell the damage tops out low and this politely removes a small attacker, while a four- or five-type board pushes it into range that outclasses most curve-appropriate threats for the price. That gradient is exactly the design intent behind domain as a mechanic: cheap and narrow if you commit nothing, genuinely strong if you build a rainbow of basic land types to feed it. The restriction to tapped creatures is what keeps the payoff honest; you cannot point it at an untapped blocker or a creature holding back on defense, so the card asks you to trade tempo (a combat step, a tap effect) for the kill rather than simply naming a target on your terms. It is the disciplined middle of the removal spectrum: not the unconditional answer, not dead weight, but a conditional kill whose reach you build toward across the game.