notice the similar pattern in their casting cost, shared name, similar rarity, similar power/toughness etc), while other cycles have members that are so distinct from one another that it may be contentious to call them a cycle (Healing Salve, Ancestral Recall, Dark Ritual, Lightning Bolt and Giant Growth are one-mana instants whose abilities include the number 3, but not only their names and effects are wildly different, Ancestral Recall is rare unlike the rest that are common) Bite a type of removal (usually green, more rarely red) which allows the player's creature to deal damage equal to its power to another creature
Arcades, at its most simple build, is really a one trick pony
Its also okay for there to be some more pushed Commanders in a set, especially when theyre mono-colored
A Mono [Color] or [Color] Devotion deck is a deck consisting primarily of cards from a single color, possibly with a small number (or "splash") of cards from a secondary color