The harpoonist is good to mirrorweave if I cast it on my main phase, then when I attack I can make my opponent's harpoonists lose flying until end of turn. If I copy a liege and have at least one more creature out than my opponent, my creatures will all be +2/+2 bigger than theirs. Either mine are unblocked and swing for massive damage, or they are blocked, clearing my opponent's board and still having one swing to their face for a decent amount.
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