13 cards where the illustration contains “black-fingernails”

Cackling Witch (Mercadian Masques #119)
Cathartic Adept (Shards of Alara #34)
Diabolic Servitude (Urza's Saga #130)
Goblin Warrens (Fallen Empires #59)
Moriok Reaver (Scars of Mirrodin #70)
Painful Quandary (Scars of Mirrodin #73)
Painsmith (Scars of Mirrodin #74)
Reconnaissance (Secret Lair Drop #1575)
Skullsnatcher (Betrayers of Kamigawa #84)
Sovereign's Bite (Core Set 2019 #120)
Timetwister (Limited Edition Alpha #84)
Torment (Stronghold #73)
Voracious Null (Battle for Zendikar #125)

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