In a format where board wipes can nullify your progress, and one where discarding cards either in search of more, or through wheels and other effects is commonplace, having ways to make use of your graveyard is key to having a flexible gameplan that can pivot as the game progresses
Ox of Agonas, Old One Eye, and Ebondeath, Dracolich require too many resources to want to regularly sacrifice to Carrion Feeder and other payoffs
MTGNexus also has extensive forums for the custom cards and Magic more generally, so you can get feedback on your creations and improve your card design
Now, some groups will let you use any old MTG planeswalker as your commander, but it's key to have that all-important rule zero discussion before you try it
If your active Pokmon could take out their active Pokmon on the next turn and they have at least one benched Pokmon, the AI will always opt to attach energy to the latter and allow you to take out the former unless attaching an energy to their active would allow them to take out your active
We look forward to seeing how the card will fare in Standard moving forward