Unhinged Draft Booster has variants:
Explore this pack in Sealed.

Sheets

Sheet basic

At rate 1/5 (20.0%)

Sheet common (color balanced)

At rate 1/55 (1.82%)

Sheet uncommon

At rate 1/40 (2.5%)

Sheet rare_mythic

At rate 1/40 (2.5%)

Sheet unhinged_foil

At rate 1/100 (1.0%)
At rate 1/160 (0.63%)
At rate 3/820 (0.37%)