Heirloom Blade is a rare Artifact — Equipment card from Secret Lair Drop (SLD), collector number 372. Current market price: $44.76 (foil $74.10), TCGplayer market prices via Scryfall.
Equipped creature gets +3/+1. Whenever equipped creature dies, you may reveal cards from the top of your library until you reveal a creature card that shares a creature type with it. Put that card into your hand and the rest on the bottom of your library in a random order. Equip {1}