I've been looking at Vintage decks on deckcheck.net.
It seems that Workshop Aggro decks use the total brokenness of Mishra's Workshop (and other Vintage cards) to land a Turn 1 or 2 threat of unfeasible size and then proceed to bash the opponent to death. It's hard for opponents who need colored mana to keep up as Workshop decks only need colorless which is amply provided by Workshop, Ancient Tomb, City of Traitors, Mana Crypt, Mana Vault and the totally busted Metalworker, as well as the more usual Moxes and Black Lotus. They can then land a Sphere or Resistance or Trinisphere or Tangle Wire to make it much harder for the opponent to do anything useful.
I've got a question, though. Why Triskelion? Karn, Silver Golem is obviously like a Tezzeret ultimate but on Turn 2. Even Juggernaut is a big dude who is pretty scary landing on Turn 1. But I don't really get Triskelion. He's a 4/4 for 6 with a tiny bit of reach. Is he there to kill Gaddock Teeg or Dark Confidant or something like that?