mtg mystery booster box card list Playtest Cards 2021 (CMB2) Gallery · Scryfall Magic: The Gathering Search Magic: The Gathering - Mystery

To be fair, the Apocalypse foil already has a pretty high premium

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The Effects Thats where the effect originates from, but lets take a look at what it does

Blastoise & Piplup GX This Tag Team duo is built for sustained pressure

The latter ability is the one that Kappa Cannoneer has, and it makes it a much more powerful threat than its initial 5U cost and 4/4 statline would make it appear to be

Granted, you have to attack them with Xyris in order for them to receive this benefit, but three life isn't a high cost for three cards