While its plenty powerful, its the effect on perceived barrier-to-entry that really posed a problem because casual players watching Commander games in passing could reasonably assume that they needed hundreds (now thousands) of dollars in Power-9 mana as table stakes, just to join the format
Lastly, the Registry allows me to send my collection to card shops and bulk graders, so they can help me find the elusive cards I still need to complete my sets, like that Fighting Energy in a 9.5 from 1st Edition Gym Heroes, which only eight people sent in to grade, and I need to complete my set
After all, if it werent for Pioneer showing us just how much these two cards have benefited from fetchlands, I think theyd have to be slam dunks to be even higher on this list
Use an old Energy or Common Pokmon card that you have extra copies of
For a Dog deck, this gives you an easy way to expand your canine army beyond its usual limited cardpool, leveraging token generators like Gleeful Demolition to swarm the board with vigilant 3/1s