Players use the term 'bear' more often to describe a 2/2 creature than they do to refer to an actual Bear
We drafted a paper version of this Cube at an R&D party recently, and I snapped up Mishra's Workshop with my first pick and never looked back
I think that the only time youll want to play this over Black Suns Zenith is if your relatively sure that youre going to hit X being ten or more (suggestions for which so far have been Roman, Ultimate, and Super plus ultra, to name a few)
Luckily with cards like Command Tower, City of Brass, Reflecting Pool, #1 below and more, getting that mana is easier than ever
Summon: Fenrir Mana acceleration is the name of the game here
As a spell or ability tries to resolve, if all its targets are illegal, that spell or ability doesn't resolve