Though most of their abilities can also be very effective on their own , such as Julieta Madrigal, who can not only heal your characters, but allows you to draw cards if you do use her ability to do that
With black not seeing much aggressive support in the MTGO Cubes I dont think well be seeing this in Vintage Cube, but its a very good fit for formats like the Arena Cubes
Finally, this new combo seems more targeted towards Commander and Modern
however, after you've grasped how they work, the primary mode is the co-op adventure
Otherwise, Squall might just appear in Commander
The Eldrazi Unbound deck has a lot of other goodies too, such as Darksteel Monolith, which lets you cast colorless spells for free once each turn