While Extort traditionally works best when directly amplifying the game plans of your Commanders, as Pack it Up suggests, there are some trickier ways to use the mechanic as well
While the lower Ranked Epurrely Xyz monsters can't do much, enough materials allow them to "evolve" into vastly more powerful Expurrely monsters
One thing not worth taking out are our star cards, Leyline of the Void and Ashiok, Nightmare Muse
Like any split card, you have to pick a version
Theres also Thundercloud Shaman, a five-mana red 4/4 that reads, When Thundercloud Shaman enters the battlefield, it deals damage equal to the number of Giants you control to each non-Giant creature. Even if you only control a handful of Giants, thats usually going to deal enough damage to wipe the board