Noxious Gearhulk

Mana cost: {4}{B}{B}
Type: Artifact Creature — Construct
Power / toughness: 5 / 4
Set: Kaladesh Inventions #3 (special)

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.

Noxious Gearhulk has 12 printings, first in Kaladesh (2016). EDHREC ranks it #1,026 among Commander cards. It appears most in Dr. Eggman decks (11,218 on EDHREC). 6 public decks on TCG run it. It has 2 official rulings.

Legality

commander: legal
legacy: legal
vintage: legal
pauper: not legal
modern: legal
pioneer: legal
standard: not legal
brawl: legal

Public decks that run Noxious Gearhulk

Death Toll - Duskmourn: House of Horror Commander, led by Winter, Cynical Opportunist
Growing Threat - March of the Machine Commander, led by Brimaz, Blight of Oreskos
Riveteer Rampage - New Capenna Commander, led by Henzie "Toolbox" Torre
Sultai Arisen - Tarkir: Dragonstorm Commander, led by Teval, the Balanced Scale
Urza's Iron Alliance - The Brothers' War Commander, led by Urza, Chief Artificer
Witherbloom Witchcraft - Commander 2021, led by Willowdusk, Essence Seer

Commanders that run Noxious Gearhulk most

Deck counts from EDHREC.

Dr. Eggman: 11,218 decks
Henzie "Toolbox" Torre: 9,735 decks
Teval, the Balanced Scale: 8,479 decks
Urza, Chief Artificer: 5,470 decks
Winter, Cynical Opportunist: 5,325 decks
Golbez, Crystal Collector: 4,812 decks
Yarok, the Desecrated: 2,808 decks
K'rrik, Son of Yawgmoth: 2,376 decks

Often played with Noxious Gearhulk

Cards that show up in the same decks on EDHREC.

Rulings

2016-09-20: Use the toughness of the creature as it last existed on the battlefield to determine how much life to gain.
2016-09-20: If 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.