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For Commander, that has the color identity of Blue and Black, sure, but it ain't both colors

Mathis, Fiend Seeker Incentivizing removal away from your board is always welcome

Emblems are typically hard-won, and losing one to a 2-mana instant would be incredibly frustrating

Buddy Blast can do massive damage based on how many Ethans Adventure cards you have in your discard pile, and it rewards aggressive, discard-heavy playstyles

Magic Cylinder was used so much back in older Yu-Gi-Oh

[1] After their Duel, Nelson continues to admire Yuma for his never-give-up "kattobingu" spirit and was happy to see him when they met again