Cheapest priced copy (Mirrodin): $4.99 at Card Kingdom, near mint, their price list as of .
War Elemental 
Creature — Elemental · 1/1 · Rare · Mirrodin · #112
When this creature enters, sacrifice it unless an opponent was dealt damage this turn.
Whenever an opponent is dealt damage, put that many +1/+1 counters on this creature.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
1 printing · $4.99 to $13.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Mirrodin | 112 | Rare | $4.99 | $13.99 |