Likely too narrow for commander unless we get a green flip legend that is bonkers. Other skeptics note that, being a common, there may be a lot of players that never bothered listing their dozen of copies just to make a couple of bucks but if we're talking $4 bucks a pop, those dozens of idle copies may start moving soon
Check out the full MTG release schedule for this year to see what expansions are coming next, including Avatar: The Last Airbender
Prior to this expansion, Christopher Robin characters were sparse and largely viewed as slow, defensive options that rarely pushed past a $2 valuation on the secondary market
Again, however, it's hard to be upset regardless of which enchanted card you pull, as pulling either of them is quite a thrill given the allegedly super low hit rates.
The bonus with Mutational Advantage is it also proliferates
This list focuses on the strength and utility of Steel cards from Into The Inklands