Cards like Glimpse the Core and Three Visits let you have options on turn two while also not monopolizing your mana if you draw them later in the game
Two enablers for this commander are the best myriad card in the game, Blade of Selves, and Legion Loyalty
But it did exist, utilizing a version of Unknown from the Lost Thunder expansion with the ability 'DAMAGE'
Its first abilities give you mana and card advantage, then you can buff up your bunny for a big swing
The Seriema The Seriema as a commander would be pretty interesting
But with that ratio, and with the drop rates in both types of boosters, I estimate that the ratio of mythics to MAR cards is about 3:2, meaning that for every two copies of a particular MAR card, theres three copies of a particular in-set mythic