cosmic encounter card sleeves FFG Insert (all expansions up to Odyssey, cards and powers sleeved) by galfridus It will cover all of the cards for both expansion and base game. 115x173mm Cosmic Encounter Sheet-50 pack,

As far as playability, Mystic Confluence only really sees play in Commander, although it's a true staple in the format, coming in at among the top 50 blue cards in the format according to EDHREC

Serra Ascendant Serra Ascendant is one of the best beat-down cards in Commander

Even better, Serperior has the move Solar Beam, which is a 4-cost move that deals 70 damage, making him a nice substitute for the active spot when needed

Each Sun & Moon: Ultra Prism - booster box contains 36 booster packs

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Although technically comprised of two different sets the first English set to be split in this way Black Bolt and White Flare are thematically tied