That's not that unique of an attribute, but he can also gain two lore every time he challenges , making for an aggressive one-two punch the moment he's played
Additionally, it can grow itself by tapping and paying a small cost to add more +1/+1 counters, making it a low-cost yet versatile card for decks focused on +1/+1 counters
Replace it with something that reduces mana cost rather than eliminates it entirely, like As Foretold or Baral Chief of Compliance
Cloud, Planet's Champion** Cloud, Planets Champion is a perfectly acceptable Boros Equipment commander with his on your turn protection and equip cost reducing, but fails to be exciting in any way after weve seen roughly a thousand Boros equipment commanders
The successful non-Oko decks were heavily tuned toward beating Oko, and its likely that many of these decks will flounder in a more open metagame