As I wrote when rating the best cards from the Modern Horizons 3 set, the Flares are all awesome cards which you should absolutely play in Commander, and perhaps even in the format they were designed for, Modern
In short order, they introduced: Affinity for artifacts, a cost-reducing mechanic Equipment, the first ever artifact noncreature subtype Artifact lands In modern times, Mark Rosewater discussed at length the problems of simultaneously developing the Mutate and Companion mechanic for Ikoria , saying that making too many new, complex mechanics at once leads to problems when developing them
Japanese-language cards only
Blightsteel Colossus Core Prowler Corpse Cur Grafted Exoskeleton Happy Dead Squirrel Ichorclaw Myr Inkmoth Nexus Mindcrank Necropede Pestilent Souleater Phyrexian Digester Phyrexian Juggernaut Plague Myr Trigon of Infestation Vector Asp
Modern In the Modern format, things tend to move swiftly
Cast it on a later turn for its foretell cost.) Sorcery Unfinished Business Return target creature card from your graveyard to the battlefield, then return up to two target Aura and/or Equipment cards from your graveyard to the battlefield attached to that creature