Typically, a player defeats their opponent(s) by reducing their life totals to zero, which is commonly done via combat damage by attacking with creatures
Back in 2019, one of WotC's stated goals for Pioneer was to provide a non-rotating format where Standard cards would rotate into by 2019, Modern's card pool had become so large that it no longer served the needed role of format where you can use your Standard cards after rotation. Pioneer was designed as that retiring home of sorts, where Standard cards could see play after being rotated out
So off to EDHREC I went, where I looked at two commanders for inspiration: Jarad, Golgari Lich Lord and Greven, Predator Captain
A massive creature, a powerful planeswalker, or a devastating spell are the kinds of threats you should build your deck around
We just have so many ways to abuse Teysa
Thieving Skydiver is here to do precisely that