tenth edition booster box Amazon.com: Magic: The Gathering Core Set 2021 (M21) Collector | 12 Packs | Min. 4 Rares Per Pack 383 black bordered playable cards Tenth Edition - Booster Pack

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There were no good answers to a Frenetic Efreet, only answers that worked half the time, so as long as you weren't far enough behind that he was ignorable the Efreet was always effective

Even if it your favorite card in the world, sometimes the one deck you'd play it in best supports two or three copies, not four

The +X/+0 part is also very relevant, allowing you either to make a big attack that you wouldnt be able to otherwise or simply to put a lot of charge counters onto a spacecraft