Cheapest priced copy (Tempest): $99.99 at Card Kingdom, near mint, their price list as of .
Aluren 
Enchantment · Rare · Tempest · #213
Any player may cast creature spells with mana value 3 or less without paying their mana costs and as though they had flash.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $99.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Tempest | 213 | Rare | $99.99 | — |
5 rulings from Wizards of the Coast
- 4 October 2004The mana cost of the creatures being cast is still the stated cost on the card, even though you did not pay the cost.
- 4 October 2004You can’t use Aluren when casting a creature using another alternate means, such as the Morph ability.
- 4 October 2004You can’t choose to cast a creature as though it had flash via Aluren and still pay the mana cost. You either cast the creature normally, or via Aluren without paying the mana cost.
- 4 October 2004Aluren checks the actual printed cost on the creature card, and is not affected by things which allow you to cast the spell for less.
- 1 August 2008If creature with X in its cost is cast this way, X can only be 0.