Many of the best Dragons, including key Commanders like The Ur-Dragon, are heavily multicolored, after all
It's hard to go too wrong regardless of preference
Consider copy spells like Narset's Reversal and Twincast for more value as well, though a single Time Warp is already enough to do some damage
Trouble in Pairs For: Trouble in Pairs is another four-mana enchantment that in theory will draw you a lot of cards
Invent Superiority: Utilizing the best of the "artifact-matters" cards from white, blue, black, and red, this "Artifice" deck and its commander Breya, Etherium Shaper will have you constructing the most efficient machines possible
Your presence actually matters