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The effect is triggered immediately and negates the opponent's monster effect + does not receive effects other than this card

But Ive also talked about how comparing cards via focusing only on their negatives is a poor way of evaluating cards, and having 2 power isnt nothing, since I usually tend to see Stoneforge Mystic more in aggressive decks than control ones, and his second ability isnt useless either (Heirloom Blade, Umezawas Jitte, The Aetherspark, Cori-Steel Cutter, Skullclamp and the swords for cubes running them) and because of that, Im looking at it more in competition with more beatdown-oriented white creatures like Luminarch Aspirant and Intrepid Adversary

Its easy to use a little too much strength and cut yourself

This turn, if a "D/D/D" monster attacks, your opponent cannot activate effects until the end of the Damage Step