Karn checks your 100-card list for color-identity legality, mana base, ramp, draw and removal balance, missing staples, and synergy gaps, then suggests prioritized upgrades
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But the table does suggest that you should be leaning more towards the best four performing archetypes (BR Party, BW Clerics, RW Warriors, and UB Rogues) if possible
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It featured in some of the earliest decks in the game, it was a pivotal piece of the Sligh deck which essentially acted as the foundation of the mono red aggro archetype, and its presence has been significant in Modern from the first day of the format as it has featured in many of the formats best decks from Zoo to Splinter Twin to Jund