Cheapest priced copy (Tarkir: Dragonstorm): $6.99 at Card Kingdom, near mint, their price list as of .
Herd Heirloom 
Artifact · Rare · Tarkir: Dragonstorm Promos · #144p
{T}: Add one mana of any color. Spend this mana only to cast a creature spell.
{T}: Until end of turn, target creature you control with power 4 or greater gains trample and "Whenever this creature deals combat damage to a player, draw a card."
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
4 printings · $6.99 to $11.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Tarkir: Dragonstorm Promos | 144p | Rare | $7.49 | $7.99 |
| Tarkir: Dragonstorm Promos | 144s | Rare | — | $8.99Out of stock |
| Tarkir: Dragonstorm | 144 | Rare | $6.99 | $6.99 |
| Tarkir: Dragonstorm | 347 | Rare | $8.49 | $11.99 |
One ruling from Wizards of the Coast
- 4 April 2025Once Herd Heirloom’s last ability has resolved, lowering the affected creature’s power below 4 won’t cause it to lose those abilities.