Oath of Druids, Natural Order, Omniscience, and Dream Halls all can put Progenitus into play for a discount, at which point your opponent has two turns to draw an answer, and effective answers to Progenitus are few and far between
Designer Notes: Put together powerful combinations with your commander and copy powerful spells
This can be an easy trigger to achieve and Akki Battle Squad has great stats for its MV
If your opponents are reckless, this can leave you with an overwhelming and game-winning card advantage
Steels slower pace can make it a good ink colour to pair with sapphire cards, which can provide the extra ink you need to get big cards out earlier, or a faster colour such as ruby, which can provide some faster options earlier in the game