Tezzeret's Betrayal is a rare Sorcery card from Aether Revolt (AER), collector number 191. Current market price: $0.09, TCGplayer market prices via Scryfall.
Destroy target creature. You may search your library and/or graveyard for a card named Tezzeret, Master of Metal, reveal it, and put it into your hand. If you search your library this way, shuffle.