these colors contain the most potent enablers and payoffs for the archetype (there arent really any green Young Pyromancers or white Treasure Cruises, for example)
Despite Magic: The Gathering's fantastical settings, which tend to lean towards Goblins, Elves, and the like, Dogs have made a home for themselves here too
There are also strong combo-style lines with Thornbite Staff, Ashnod's Altar, and Staff of Domination, and token loops around Krenko, Mob Boss that can spiral into game-ending damage
Blasphemous Edict Paying 5 mana in black to cast Blasphemous Edict and destroy all creatures is very strong, to the point of seeing Constructed play in many formats
They fit perfectly in sleeves, deck boxes, and binders