Cheapest priced copy (Forgotten Realms Commander): $0.35 at Card Kingdom, near mint, their price list as of .
Heirloom Blade 
Artifact — Equipment · Uncommon · The Lost Caverns of Ixalan Commander · #303
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}
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
10 printings · $0.35 to $49.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Forgotten Realms Commander | 208 | Uncommon | $0.35 | — |
| Commander 2017 | 52 | Uncommon | $0.49 | — |
| Commander 2020 | 242 | Uncommon | $0.39 | — |
| Jumpstart 2022 | 775 | Uncommon | $0.35 | — |
| The Lost Caverns of Ixalan Commander | 303 | Uncommon | $0.35 | — |
| Tales of Middle-earth Commander | 279 | Uncommon | $0.49 | — |
| The List | C17-52 | Uncommon | $0.35 | — |
| Wizards Play Network 2024 | 16 | Rare | $0.49 | $1.49Out of stock |
| Secret Lair Drop | 372 | Rare | $39.99 | $49.99 |
| Zendikar Rising Commander | 113 | Uncommon | $0.35 | — |
6 rulings from Wizards of the Coast
- 25 August 2017If Heirloom Blade leaves the battlefield at the same time that the equipped creature dies, its triggered ability triggers.
- 25 August 2017You'll reveal cards until you find one that shares at least one creature type with the creature that died. For example, if a Cat Wizard dies, you'll stop if you reveal a Human Wizard or Cat Soldier.
- 25 August 2017If the equipped creature has no creature type, no card can share a creature type with it.
- 25 August 2017"Artifact" isn't a creature type.
- 25 August 2017Compare the revealed cards to the creature as it last existed before it died, not to the creature card as it exists in its owner's graveyard, to determine which one you put into your hand.
- 25 August 2017If you don't reveal a creature card that shares a type with the creature that died, you'll just reveal and randomize your library.