13 cards where the card types include “nightstalker” or the text includes “nightstalker”

Abyssal Nightstalker (Portal Second Age #61)
Breathstealer (Mirage #109)
Brutal Nightstalker (Portal Second Age #64)
Fen Stalker (Prophecy #64)
Feral Shadow (Starter 1999 #77)
Lurking Nightstalker (Portal Second Age #77)
Nightstalker Engine (Portal Second Age #81)
Predatory Nightstalker (Vintage Masters #134)
Prowling Nightstalker (Masters Edition IV #93)
Raiding Nightstalker (Portal Second Age #84)
Return of the Nightstalkers (Portal Second Age #88)
Shimian Night Stalker (Chronicles #36)
Urborg Panther (Mirage #150)

The message was clear to Sorin—time to search for something else.