Apparently the AI just has no understanding of how Fiera's ability works, and will play as if it doesn't exist. Thus I made a deck of entirely reasonable aegis creatures and ways to find Fiera out of the market. My manabases suck, but I'm not sure what I would change to make this one better.
Scornful Elite could also be in here if it turns out gauntlet aggros too hard, but it hasn't been a problem so far.
edit: also this run of testing had a very large number of games where the oppo were stuck on 2-3 power, (over 20%)
edit 2: after thinking about it some more, i think save the day is the perfect card for market. after some more runs, there have been tons of situations where that card would have saved the day(sorry pun, cant help it)