Seven power is the magic number that divides evenly into 21 for commander damage, so youre not necessarily going to rely on Miirym to win the game that way
The cube I've made is a 450 card singleton pauper cube, primarily drawing on sets from Lorwyn (2007) up through Throne of Eldraine (2019), with a few going back as far as Mirrodin (2003)
But, if Cheatyface sticks around for a little while, and your opponent doesnt see you sneak it out from under an Island you played last turn, you have a free attacker
Everyone wants to shoot stuff for Lightning Bolts
The lizard part of Kindlespark Duo is much more important than otter synergies
The weakest of these is Bandag e, as its main effect is to prevent a single damage to a creature