chansey pokemon card first edition · Base Set #3 (Shadowless) edge (80) Chansey does 80 damage to itself. Chansey First Edition | eBay

There's more benefit with more opponents

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Its also great alongside Indestructible creatures like Hazoret, Godseeker, since you get all the benefits but still keep your creature

But the biggest chase cards are Jeweled Lotus, Mana Drain, Vampiric Tutor, and other powerhouse cards in extended art versions only found in Collector boosters

(Choose any number of permanents and/or players, then give each another counter of each kind already there.) The set of permanents affected by Mutational Advantage is determined at the time Mutational Advantage resolves