Sapphire/Steel is already a potent color combination, so there's a good chance you can take this deck and turn it into something great
Brawl Legal Vintage Legal Timeless Legal Commander Legal Pauper Not Legal Oathbreaker Legal Penny Not Legal Toolbox Notes and Rules Information for Cloud, Midgar Mercenary: Triggered abilities use the word "when," "whenever," or "at." They're often written as "[Trigger condition], [effect]." Some keyword abilities are triggered abilities and will have "when," "whenever," or "at" in their reminder text
These figures may feel vaguely familiar but also have an air of intrigue to them it is unclear where they come from because they are only partially formed, having been summoned from a damaged lorebook page
Theres also the tried and true ramp into powerful characters option
In Magic terms, while Ruby does have some of the aggressive nature of Red along with creature control, Id actually say its closer to Rakdos in playstyle Red and Black combined
So you mostly will want this in control decks