red pokemon card book Ultra Pro Binder: Charizard free material to ensure your cards are well protected and preserved. Stealth 9 Pocket Zip Binder

If you want to round out your go-wide theme a bit more, I'd recommend Commissar Severina Raine as another group slug option that can also act as a draw piece

Manaphy blocks any damage done to your Benched Pokmon by the attacks of your opponents Pokmon but does not prevent the placement of damage counterswhether by attack or by any ability

Hazels Brewmaster Very much in the Agatha's Soul Cauldron space, Hazel's Brewmaster does infinite things with Academy Manufactor and Pippin, Warden of Isengard, typical EDH food deck cards

The Sultai version is slightly more expensive than the one above, but that will give you a nice upgrade path if you enjoy the deck

And of course, in older formats it gets busted pretty fast

There were two pieces here that resonated with me most