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Sol Ring and Arcane Signet are included in every preconstructed deck now, and will almost certainly improve any deck

Whenever he banishes another character in a challenge you can ready him and challenge again

Kellogg, Dangerous Mind wont warp the format or anything

Still, these decks are aimed at beginners, so that's worth keeping in mind before you make a purchase

But while the equipment you choose might vary between builds, the support cards you run are generally solid no matter what the strategy

From his rules text alone, you can see reasons to prioritize card draw, scrying, instants/sorceries, artifact tokens, Clues specifically and commander damage