OLL 7
Small lightning bolt · 4 of 9 top stickers yellow
r U R' U R U2 r'7 moves · Probability 1/54 · Mirror: OLL 8 · Inverse: OLL 6

Setup: apply these moves to a solved cube to reach this case
r U2 R' U' R U' r'Small lightning bolt · 4 of 9 top stickers yellow
r U R' U R U2 r'7 moves · Probability 1/54 · Mirror: OLL 8 · Inverse: OLL 6

r U2 R' U' R U' r'