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.