It's associated with some of old-school Magic: The Gathering 's most iconic heroes like Urza and Gerard Capashen
Plus, if you dont need another artifact on your board, it can explode like some kind of Treasure token pinata to piece together some surprise kills with the aforementioned cards
In Commander, its obviously a slam dunk inclusion in any deck with some reasonable Demons to tutor up
Starmie ex is one of these, as it costs 2 energy to attack, and can easily be accelerated by powerful supporter cards like Misty, which can accelerate energy to it
Like True-Name Nemesis, it's fairly cheap at one colorless and two Blue mana
Those effects are particularly good for this deck's stun and shield counters, keeping opposing creatures locked down and your own creatures safe, as well as for blitzing through the strong effects of your saga creatures