43 cards where the colors is B and the set is “leg”

Abomination (Legends #87)
All Hallow's Eve (Legends #88)
Blight (Legends #89)
Carrion Ants (Legends #90)
Chains of Mephistopheles (Legends #91)
Cosmic Horror (Legends #92)
Cyclopean Mummy (Legends #93)
Darkness (Legends #94)
Demonic Torment (Legends #95)
Evil Eye of Orms-by-Gore (Legends #96)
Fallen Angel (Legends #97)
Ghosts of the Damned (Legends #98)
Giant Slug (Legends #99)
Glyph of Doom (Legends #100)
Greed (Legends #101)
Headless Horseman (Legends #102)
Hellfire (Legends #105)
Hell's Caretaker (Legends #104)
Hell Swarm (Legends #103)
Horror of Horrors (Legends #106)

This card does not meet Magic community standards.

Imprison (Legends #107)
Infernal Medusa (Legends #108)
Jovial Evil (Legends #109)
Lesser Werewolf (Legends #110)
Lost Soul (Legends #111)
Mold Demon (Legends #112)
Nether Void (Legends #113)
Pit Scorpion (Legends #114)
Quagmire (Legends #115)
Shimian Night Stalker (Legends #116)
Spirit Shackle (Legends #117)
Syphon Soul (Legends #118)
Takklemaggot (Legends #119)
The Abyss (Legends #120)
The Wretched (Legends #121)
Touch of Darkness (Legends #122)
Transmutation (Legends #123)
Underworld Dreams (Legends #124)
Vampire Bats (Legends #125)
Walking Dead (Legends #126)
Wall of Putrid Flesh (Legends #127)
Wall of Shadows (Legends #128)
Wall of Tombstones (Legends #129)

In the blink of an eye, they strode from deep snow to the end of this search.