Cheapest priced copy (Commander 2021): $0.99 at Card Kingdom, near mint, their price list as of .
Noxious Gearhulk 
Artifact Creature — Construct · 5/4 · Mythic · Kaladesh · #96
Menace
When this creature enters, you may destroy another target creature. If a creature is destroyed this way, you gain life equal to its toughness.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
11 printings · $0.99 to $99.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The Brothers' War Commander | 110 | Mythic | $1.29 | — |
| Commander 2021 | 148 | Mythic | $0.99 | — |
| Duskmourn: House of Horror Commander | 151 | Mythic | $1.29 | — |
| Kaladesh | 96 | Mythic | $1.99 | $11.99 |
| March of the Machine Commander | 260 | Mythic | $0.99 | — |
| Kaladesh Inventions | 3 | Special | — | $99.99 |
| New Capenna Commander | 254 | Mythic | $1.29 | — |
| Kaladesh Promos | 96p | Mythic | $6.49 | $11.99 |
| Kaladesh Promos | 96s | Mythic | — | $16.99 |
| Tarkir: Dragonstorm Commander | 191 | Mythic | $1.29 | — |
| Avatar: The Last Airbender Eternal (Fire Nation Tank Train) | 25 | Mythic | $1.49 | $1.99 |
2 rulings from Wizards of the Coast
- 20 September 2016Use the toughness of the creature as it last existed on the battlefield to determine how much life to gain.
- 20 September 2016If the target creature has indestructible, it isn't destroyed this way and you won't gain life. If it is destroyed but put into a zone other than a graveyard, you'll gain life.