From his rules text alone, you can see reasons to prioritize card draw, scrying, instants/sorceries, artifact tokens, Clues specifically and commander damage
but at the same time, if your synergy is sound, you can put together some solid decks within the limitations, and then reap the rewards of these powerful new Glimmers
(1) Add 1 Level 4 or lower Fiend monster from your GY to your hand, or, if you control "Red Dragon Archfiend" or a Synchro Monster that mentions it, you can add the monster from your Deck instead
Use clean hands or wear gloves to handle your cards, and never eat or drink while handling them
COPY THE URL BELOW
The Nintendo Account User Agreement, including the Purchase and Subscription terms, apply