One possibility is to cast Apocalypse, a card that gets rid of everything, including your hand, leaving you only with Barren Glory, but that needs to be done on your upkeep, so there are options like Leyline of Anticipation or Emergence Zone to give these spells flash
Anrakyr the Traveller is my commander of choice because casting spells by paying life rather than mana has never been fair in the history of Magic, no matter how many times Wizards prints cards that do it
As it shapes the Multiverse around it, we've captured these transcendental styles of the Edge across the Booster Fun treatments of Edge of Eternities
Ive got an MTG deckbuilding guide right here that breaks it down into an easy, step-by-step process
No multicolor mana costs, and no artifacts with a red color identity
Bright-Palm, Soul Awakener and Conclave Sledge Captain are good +1/+1 counter support cards, which is technically true of the backup mechanic as a whole