This is an Eternal Singleton cube.
450 cards + 32 leaders Intended for up to 8-10 drafters, or 3-4 in 'Minesweeper' Twin Suns. Updated through TS26 set.
The main way we've been drafting this is through 'Minesweeper' drafting for Twins Suns. Minesweeper drafting is where you'll lay out a grid of face down (~90)cards in a grid. We do a grid of 13x7 due to table size, but original idea from 'Solely Singleton' suggested 10x9. Then, turn the outside border cards face-up along with the middle-most card(s). Then players take turns making picks from the revealed cards available. When a pick is made, flip up all hidden cards on each side and top/bottom. After each player makes 12 picks, clear the remaining cards keeping hidden cards unknown, and replace the grid with new cards. Do four total grids, rotating the starting pick position. After four rounds at 12 cards each, you'll have 48 cards each. 45 card decks twin suns.
Pick leaders before all of the drafting cards. Still working out how to best do this, but we've been randomizing all leaders and we do three rounds of each player gets random three, then picks one, burns one and passes the third. Each player will have six leaders to begin the Minesweeper draft. Extremely fun, highly encourage trying out this method of drafting.
Solely Singleton Youtube Video explaining Minesweeper Drafting using mtg as the base game: