If the activated ability resolves but the targeted artifact isnâ€™t destroyed (perhaps because it has indestructible or it regenerates), Hoard-Smelter Dragon will still get the bonus.
If the targeted artifact is an illegal target by the time the activated ability resolves, the ability doesnâ€™t resolve. Hoard-Smelter Dragon wonâ€™t get the bonus.
If the mana cost of a permanent includes , that X is considered to be 0.
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