Trainer Cards come in multiple forms
Collision of the Realms is a relatively light chaos effect compared to something like Warp World, but it could still get a few groans from the table
My first deck had a single Island and Mountain to support two Faerie Machinists and a Shrapnel Blast while being base B/W, and while I felt a bit mana heavy with my land cyclers, it certainly worked out in the end
If your Cube features Pyretic Ritual and the like this card is very appealing, and I do imagine that it will be more effective at actually closing games on average than Empty the Warrens both for being far more effective with lower Storm counts and for producing bodies that matter far more in the late game
Longtusk CubLongtusk Cub 13
However, there is no indication that this complication affects her spark, and she returned as a planeswalker in the Tarkir: Dragonstorm set