For a long time, Karn has been used as a shutdown piece to prevent your opponent from generating mana, often alongside Mycosynth Lattice
Eternal Darkness checks off a lot of boxes when it comes to reviewing Item lock attacks
Foil The same principles as outlined above apply for foil cards
For a claim under the Authorship Warranty, submit, at your expense, written opinions of at least two (2) experts (whose principal line of business is the appraisal and authentication of art, antiquities, design objects or other valuable objects similar to the lot), that the lot fails to materially conform to the Authorship Warranty
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Big effects win games, but big effects before the right moment can just get you eliminated