Theres nothing wrong with a themeless cube
I ended up outlasting the Faldorn player, who had been whittled down by everyone else and was killed for not having a flying blocker by the Edgar Markov player
If you cast a spell this way, you may spend mana as though it were mana of any color to cast it
Getting something like a Scavenger Grounds can be a pretty big deal
Gaston Frightful Bullys Boost cost is a little high, but there are ways around that (see below)
In a deck that wants to play things from exile - of which there are many - these are just upgraded clue tokens, because they not only cost no mana, but also have so many synergies in Commander with cards like Laelia, the Blade Reforged, who gets stronger whenever you put cards into exile