Your search for "Perimeter Enforcer 31" revealed the following:
Perimeter Enforcer (MKM) from Murders at Karlov Manor, available at 401 Games Canada. Rarity: Uncommon Finish: Normal Artist: Josh Hass Card Text:Flying, lifelinkWhenever another Detective enters the battlefield under your control and whenever a Detective you control is turned face...
Perimeter Enforcer (Foil) (MKM) from Murders at Karlov Manor, available at 401 Games Canada. Rarity: Uncommon Finish: Foil Artist: Josh Hass Card Text:Flying, lifelinkWhenever another Detective enters the battlefield under your control and whenever a Detective you control is turned...