Will the Wise is just a fun Commander, occupying a similar faux-group-hug space as Kwain, Itinerant Meddler or Breena, the Demagogue
As soon as Decimator Beetles ability resolves, state-based actions are checked, and the game sees that you have both counter types on your Servant, so one +1/+1 counter and one -1/-1 counter are removed at the same time (resulting in Servant dying)
Unlike bestow or meld or any of the past attempts at such a mechanic, the templating of mutate leaves plenty of room to access the effect differently
Youll most often make Slugs by casting removal spells, making this hit somewhere between Toshiro Umezawa and Massacre Girl when it comes to deckbuilding there arent enough good Slugs for Tribal Slugs
For more on Pokemon TCG Pocket, take a look at our Venusaur ex deck, our Blastoise ex deck, and our free-to-play friendly Ninetales and Rapidash deck
Triggered on an opponents attack, it destroys all their Attack Position monsters a massive momentum flip thats kept it in the running for the strongest Yu-Gi-Oh