This trigger fits incredibly well into aristocrat, Grixis, and Rakdos decks
Ruby ink cards are typically focused around putting their players on a better foot to challenge their opponents characters, as well as enabling them to banish opposing characters more easily
Obviously this isn't great for competitive play, but can augment a casual game for a really fun experience
In EDH, think Senseis Divining Top, Scroll Rack, and the many cards that let you scry as part of spell resolution
While the timing and circumstances of how these mechanics care about the number of colors you have varies, theyre similar in that both mechanics work best in decks with three, four, even five colors