Colorless Pokemon are easy to slide into any deck and can be used as a way to play aggressively, eliminate Pokemon without knocking them out, or even get your other cards from your deck to your hand
It takes very little to make it a serious problem
Flavor Text "Dormi bene, e che le ombre ti accolgano." P/T Number 577 Language Italiano Legal Formats Alchemy, Brawl, Commander, Competitive Brawl, Historic, Legacy, Modern, Pioneer, Standard, Timeless, Vintage Rulings (6/6/2025) If the target creature is an illegal target as Y'shtola Rhul's ability tries to resolve, it won't resolve and none of its effects will happen
What is an MTG Mulligan
The only thing that keeps him from being one of the most powerful creatures of all time is that most multiplayer games these days start with enough life to essentially half his power and usefulness