Bolshack Dragon is a rare Creature — Armored Dragon card from Mystery Booster 2 (MB2), collector number 558. Current market price: $0.22, TCGplayer market prices via Scryfall.
Double b̶r̶e̶a̶k̶e̶r̶ strike While attacking, this creature gets +10̶0̶0̶ power for each f̶i̶r̶e̶ red card in your graveyard.