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Both of these have their own pros and cons

Im not and have never been an MTG judge, but you can sit back and enjoy this summary of how to use the level up mechanic (insert Super Mushroom sound)

This is a set of nine cards that originated in the very earliest days of the game within the Alpha, Beta, and Unlimited sets

Ready-to-play 51-card deck

But if you change this with something like Opalescence (or are using the Faceless One), then your background commander would be affected and could be targeted by anything that says commander creature. Most of the cards that refer to commander creatures instead of just commanders are background cards themselves