Decide whether you want to stay on the equipment and token generation plan too and, if not, get rid of some cards there
Fees and turnaround times eat into your wallet, so do the math first
It might be different if you have unlimited amounts of free time on your hands and enjoy sorting Magic cards, but for most people, paying 10% plus $0.03 per card is a great deal because it allows you to avoid hours of work sorting your cards, typing them into buylists (potentially multiple buylists to maximize your profits), and dealing with the hassle (and cost) of shipping a bunch of different packages around the country
Note that this doesnt care about who controlled the creatures that died, so you can throw a bunch of tokens into your Viscera Seer to set up a huge swing of card advantage
Hitting the threshold needed to win with these is very easy, and you'll likely find yourself winning with these permanents over combat if you can't break through defenses