A Trainer like Welder alone makes this set worth it, giving you the ability to attach energy and draw cards without burning your attach step
Like any split card, you have to pick a version
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
It has all the good low end playability and consistency benefits but it transforms into a it of a Demonic Tutor at some point in the game and puts in some really good work
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