Your search for "Bloodmark Mentor 83" revealed the following:
Bloodmark Mentor - DPA Reprint (PLST) from The List, available at 401 Games Canada. Rarity: Uncommon Finish: Normal Artist: Dave Allsop Card Text:Red creatures you control have first strike.
Bloodmark Mentor (SHM) from Shadowmoor, available at 401 Games Canada. Rarity: Uncommon Finish: Normal Artist: Dave Allsop Card Text:Red creatures you control have first strike.
Bloodmark Mentor (Foil) (SHM) from Shadowmoor, available at 401 Games Canada. Rarity: Uncommon Finish: Foil Artist: Dave Allsop Card Text:Red creatures you control have first strike.
Bloodmark Mentor (DPA) from Duels of the Planeswalkers, available at 401 Games Canada. Rarity: Uncommon Finish: Normal Artist: Dave Allsop Card Text:Red creatures you control have first strike. (They deal combat damage before creatures without first strike.)
Bloodmark Mentor (DDG) from Duel Decks: Knights vs. Dragons, available at 401 Games Canada. Rarity: Uncommon Finish: Normal Artist: Dave Allsop Card Text:Red creatures you control have first strike.