Based on the Pokmon species being used, retreat costs can range from a whopping five Energy to completely free, so the cost tends to vary from deck to deck
Bojuka Bog is a less effective option, since your opponent can only play it on their own turn
Crown of Doom Crown of Doom zips around the table, which can be fun and chaotic, as well as fine in Zedruu the Greathearted, but it mostly hurts you in the long run if you arent synergizing
For example, during a Strixhaven Limited event, you can't add Dragon's Approach from your personal collection
Your choice of commander is often a bottom-up decision
Millennium Ankh is one of the best because it can Fusion Summon The Unstoppable Exodia Incarnate using the pieces from your deck