mtg are unfinity cards legal has stickers - and they're in Commander Was making Unfinity cards legal

Bonus sheet rarity Several MTG sets have contained a 'bonus sheet' of thematically appropriate reprint cards, which can be used in limited games but aren't considered part of the set for other purposes - they don't become part of the MTG Standard rotation if they're printed in a Standard-legal set

You get tons of value, but you need to tailor your deck list to the commanders specifications

Decimate can generate enormous value as a four-for-one, and that kind of ratio is rare outside of boardwipes

While Vexilus Praetor can be very strong especially if your Commander is a Planeswalker

It makes it hard to use the same turn you play it