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Its not glamorous, but Abrade will simply be the most-played Standard card from Hour of Devastation, even though its in direct competition with Harnessed Lightning, arguably the best removal spell in Standard, at the same mana cost

Not at all

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Those cards are considered to be "used to craft" that permanent as long as they remain exiled and the permanent remains on the battlefield, even if the permanent's controller changes or some of its characteristics change (because of a copy effect, for example.) If the materials required include multiple objects, you may exile some of them from among permanents you control and the rest from among cards in your graveyard