Each creature can only attack once per combat phase, including menace creatures
I think you play two copies in the sideboard of a deck that can cast Locke
Ancient Grudge, which has moved up to uncommon, has almost no compelling targets
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If I take a look at the average decklist, in addition to the lands and Sol Ring, its relying on a couple of mana rocks, Cultivate, and Kodamas Reach to fix the colors and get enough mana to cast Atraxa and your higher-cost spells
