Arclight Phoenix

In Modern and Pioneer, Arclight Phoenix is a format-defining card — spell-heavy decks like Izzet Prowess and Treasure Cruise shells run it as their primary threat precisely because three cheap cantrips in one turn is trivially achievable. Legacy gives it even more fuel but faces stiffer competition from faster combo decks, so it appears but isn't dominant. In Commander, Arclight Phoenix is niche: the singleton rule limits recursion density, and casting three instants or sorceries in a single turn is harder to reliably sequence without a dedicated spellslinger build; it earns its slot in Syrix or storm-adjacent decks but is filler in anything else.