Your search for "Skirk Prospector 137" revealed the following:
Skirk Prospector (DMR) from Dominaria Remastered, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Slawomir Maniak Card Text:Sacrifice a Goblin: Add R.
Skirk Prospector (Foil) (DMR) from Dominaria Remastered, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Slawomir Maniak Card Text:Sacrifice a Goblin: Add R.
Skirk Prospector (Foil) (ONS) from Onslaught, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Doug Chaffee Card Text:Sacrifice a Goblin: Add R to your mana pool.