Cheapest priced copy (Mirrodin): $1.79 at Card Kingdom, near mint, their price list as of .
Rust Elemental 
Artifact Creature — Elemental · 4/4 · Uncommon · Mirrodin · #234
Flying
At the beginning of your upkeep, sacrifice another artifact. If you can't, tap this creature and you lose 4 life.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
1 printing · $1.79 to $8.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Mirrodin | 234 | Uncommon | $1.79 | $8.99Out of stock |
One ruling from Wizards of the Coast
- 1 December 2004Sacrificing an artifact isn't optional. If you control an artifact other than Rust Elemental, you must sacrifice it. Otherwise, you must tap Rust Elemental and lose 4 life.