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If youre the beat down thats not a huge limitation, but the card would be significantly better if it did offer the buff at all times, as it would make it pretty impossible for your opponents to attack you, too

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This means it is able to be used like a Quick Effect Spell that can be used from the Hand on both players' turn

(See rule 508, Declare Attackers Step.) 306.7

That, plus Start Playing Commander Here and the presence of a single foil mythic, tells me that this set of decks is all reprints