Cheapest priced copy (Eventide): $3.99 at Card Kingdom, near mint, their price list as of .
Rise of the Hobgoblins 
Enchantment · Rare · Eventide · #145
When this enchantment enters, you may pay {X}. If you do, create X 1/1 red and white Goblin Soldier creature tokens.
{R/W}: Red creatures and white creatures you control gain first strike until end of turn.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
1 printing · $3.99 to $15.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Eventide | 145 | Rare | $3.99 | $15.99 |
One ruling from Wizards of the Coast
- 1 August 2008When the "enters" ability resolves, you choose the value of X, pay for it, and put the tokens onto the battlefield. You can activate mana abilities to pay for {X}, but no one can cast spells or activate abilities in response to this choice.