Cheapest priced copy (Portal): $4.49 at Card Kingdom, near mint, their price list as of .
Fire Dragon 
Creature — Dragon · 6/6 · Rare · Portal · #125
Flying
When this creature enters, it deals damage to target creature equal to the number of Mountains you control.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $4.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Portal | 125 | Rare | $4.49 | — |
One ruling from Wizards of the Coast
- 1 October 2008If there are no other creatures on the battlefield, Fire Dragon will have to target itself. The ability is mandatory.