Damage isn't removed from this creature during cleanup steps
This fact was further confirmed by Rustywolf, a YouTuber who created a tool that makes it possible to see the information that is sent by the Pokemon TCG Pocket servers during pack selection
Your artwork is amazing! Awwwww, glad you put Terrence in there, too
Then you can mana sink 6 mana here (You are in mono-black, so might I suggest Cabal Coffers and Cabal Stronghold and Nykthos, Shrine to Nyx here to make it?) and give your entire team lifelink for the turn to get a massive life swing for attacks, blocks, and triggering him and other things
So in total including all the leagues you get 42 Booster Packs
Bess, Soul Nourisher Reading Bess tells you exactly how you want to build her