Cheapest priced copy (Return to Ravnica): $0.49 at Card Kingdom, near mint, their price list as of .
Volatile Rig 
Artifact Creature — Construct · 4/4 · Rare · Return to Ravnica · #236
Trample
This creature attacks each combat if able.
Whenever this creature is dealt damage, flip a coin. If you lose the flip, sacrifice this creature.
When this creature dies, flip a coin. If you lose the flip, it deals 4 damage to each creature and each player.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Return to Ravnica | 236 | Rare | $0.49 | $0.49 |
One ruling from Wizards of the Coast
- 1 October 2012If Volatile Rig is dealt damage by multiple sources at the same time (for example, multiple blocking creatures), its first triggered ability will trigger only once.