I have been testing him in shop aggro as Lodestone 2-5 since the day he was previewed (a few weeks ago), and he is already my favourite workshop creature of all time right beside Lodestone
So many people seem to think his untap ability is a downside, but it's arguably one of his better features. He's not a 7/7 trample with untap issues, he is a 7/7 Trample with Vigilance.
I'd post a list, but I can comfortably say if you are playing shop aggro play 4 regardless of your list. He is that good
For reference :
Traxos, Scourge of Kroog
4
Legendary Artifact Creature - Construct
7/7 trample
Comes into play tapped
Doesn't untap during untap step
Whenever you play an historic untap him