There is a recipe for 10k spell fragments and 3 blueprints to make a single bear artifact available in the MA.
You can see that mine has the increased Vision Vapor (only 1 point, atm). I've placed and fed my Red Panda. It's now at level 4 on evolution, and I plan to evolve it completely. As much as I like the other bears, I want the increase in VV - I craft a lot, and it's a good way to get free diamonds in game (crafting, that is, as you have a chance of getting diamonds with every other chest you open in the MA). I just won 500 diamonds in my Harandor city through the MA Mystical Object today, in fact.
But if you prefer focusing your game on tournaments and the 3 VV (I'm only getting 1 right now) isn't a benefit for you for whatever reason, then it might be more beneficial to you to exchange them for bears.
The bear artifacts have already made an appearance in the Spire this year, and I don't know whether they will be coming around again once all of the previous evolving buildings have had a turn. I truly hope they do. As cute as my level 4 brown bear is, I want the increase in military units I can get at higher levels. I also want to be able to evolve a Panda Bear.