Bruenor Battlehammer is a rare Legendary Creature — Dwarf Warrior card from Secret Lair Drop (SLD), collector number 2771. Current market price: $1.77 (foil $4.52), TCGplayer market prices via Scryfall.
Each creature you control gets +2/+0 for each Equipment attached to it. You may pay {0} rather than pay the equip cost of the first equip ability you activate each turn.