It wouldnt be a main game at all as there is an energy system that does limit your playtime quite a bit, in addition to the keys system for additional story mode play(This is a farmable currency)
Again, this system is best used with a Toploader
If there are four or more chorus counters on Malcolm, you may cast the discarded card without paying its mana cost
This will, of course, have you building a deck with all the best Angels, Demons, and Dragons you can get your hands on cards like: Master of Cruelties Avacyn, Angel of Hope Terror of the Peaks 1 Giada, Font Of Hope Ramp And Power Easily the most consistent and powerful Angel commander you can run is the savior of New Capenna, Giada, Font of Hope
Given it's once per turn I don't think it's going to slot that well into "not your hand" decks