Black has oodles of fabulous cards, and thankfully a lot of them are replacement level, especially when it comes to removal, aristocrats and life drain/gain
Heavy Polymerization MP24-EN150 YuGiOh 25th Anniversary Tin: Dueling Mirrors Keep track of your collection value over time
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That makes it seamless to set off any desired Fire King effect right away
Considering how much treasure Edward can produce, any of these abilities has the potential to be very impactful if their effects are relevant in Commander
Personally I've been including at least five Trainer cards in each deck I've been running as I like having access to the extra bonuses they offer, but you're free to add as many or as little as you like