Your search for "Boros Cluestone 175" revealed the following:
Boros Cluestone (Foil) (DGM) from Dragon's Maze, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Raoul Vitale Card Text:T: Add R or W to your mana pool.RW, T, Sacrifice Boros Cluestone: Draw a card.
Boros Cluestone (DGM) from Dragon's Maze, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Raoul Vitale Card Text:T: Add R or W to your mana pool.RW, T, Sacrifice Boros Cluestone: Draw a card.
Boros Cluestone (C15) from Commander 2015, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Raoul Vitale Card Text:T: Add R or W to your mana pool.RW, T, Sacrifice Boros Cluestone: Draw a card.
Boros Cluestone (CM2) from Commander Anthology Volume II, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Raoul Vitale Card Text:T: Add R or W.RW, T, Sacrifice Boros Cluestone: Draw a card.