I dont want to copy and paste all the cheap mana-fixing artifacts that are out there from the Celestial Prism entry, so instead Ill just name the best generic one Chromatic Lantern
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Its hard to attack through all their tokens, but Cryptolith Rite decks tend to be good at winning without needing to attack, and G/W Tokens isnt good at killing them or disrupting their engine, but its difficult to design a Cryptolith Rite deck thats actually good at winning a game against an opponent who can regularly kill all of their creatures with Archangel Avacyn, Tragic Arrogance, and Planar Outburst
You'll also need some six-sided dice to represent damage on your characters, as well as a way to keep track of each player's Lore, whether that be a notepad, smart phone, or the digital Lore tracker on the official Disney Lorcana app
Some colors perform well with others in cross-color synergies