Cheapest priced copy (Archenemy): $0.49 at Card Kingdom, near mint, their price list as of .
Imperial Hellkite 
Creature — Dragon · 6/6 · Rare · Legions · #103
Flying
Morph {6}{R}{R} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)
When this creature is turned face up, you may search your library for a Dragon card, reveal it, put it into your hand, then shuffle.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
3 printings · $0.49 to $19.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Archenemy | 42 | Rare | $0.49 | — |
| Legions | 103 | Rare | $0.49 | $19.99 |
| Murders at Karlov Manor Commander | 155 | Rare | $0.49 | — |
2 rulings from Wizards of the Coast
- 4 October 2004You do not have to find a Dragon card if you do not want to, even if you have one in your library.
- 4 October 2004The trigger occurs when you use the Morph ability to turn the card face up, or when an effect turns it face up. It will not trigger on being revealed or on leaving the battlefield.