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Collector Boosters are where youre most likely to hit the premium versions of those Archive spells (and other Booster Fun variants), and you're guaranteed to find at least three Mystical Archive cards in Collector Boosters

Shardless Agent has changed the format probably the most in enabling 2 entire archetypes, Living End and especially Temur Rhinos, being absolute top contenders in the format

Mana rocks like Chromatic Lantern and Chromatic Orrery also help you to get access to every color of mana

It has the potential to destroy a ton of creatures on the battlefield, so long as they have equal toughness to each other

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My reasoning was that Mark Rosewater had explained difficulties designing straight four-color cards in the past, because there are too many colors fighting for representation, and you need to design around the missing color (what this four-color card isn't about)