You can use 4-5 colors if you want, but it requires a very carefully curated manabase
Splinter Twin was a consistently good deck that was regularly near the top of the Modern meta, but it was never a problematic deck if you dig into things like metagame percentage, and it wasn't even the top deck in the meta at many points during its lifespan in Modern
So lets go ahead and take a look at some of the best prowess cards in Magic
Judge promos are given to Judges as rewards for their work and contribution to the game, such as alternate art versions of Elesh Norn, Grand Cenobite
Chrononauts has three separate ways to win: alter the timeline in the right ways, fulfill your mission by collecting a certain combination of three artifacts, or have ten cards in your hand at the end of your turn
ETB draw 3 is amazing, and you're making friends