Zeddicuus
Never played in a homebrew format. That sounds like it could be suitable casual fun that is budget smart. How does it work exactly?
Basically it came about during Ravnica:City of Guilds. Locally referred to as Guilds.
You could choose or get a randomly assigned [+5 build points] "guild" (ie color combination of one or more colors). Then you build a 40 card deck. 1 rare, 4 uncommons, the rest commons.
The point of build points is that you use them to modify your deck. Adding cards costs points (based on rarity), removing cards is 1 pt, and getting special static effects (like an extra land at the start) costs points, and getting special additional game effects (like a one time effect (per game with a mana cost) that gave you defenders). You got build points for playing, winning, achievements and difficulty of opponents.
I've had limited success running it as a league on Gaia.