Your search for "Slaughterhorn 136" revealed the following:
Slaughterhorn (MM3) from Modern Masters 2017, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Steve Prescott Card Text:Bloodrush — G, Discard Slaughterhorn: Target attacking creature gets +3/+2 until end of turn.
Slaughterhorn (Foil) (MM3) from Modern Masters 2017, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Steve Prescott Card Text:Bloodrush — G, Discard Slaughterhorn: Target attacking creature gets +3/+2 until end of turn.