Cheapest priced copy (Duel Decks: Phyrexia vs. the Coalition): $0.69 at Card Kingdom, near mint, their price list as of .
Darigaaz, the Igniter 
Legendary Creature — Dragon · 6/6 · Rare · Invasion · #243
Flying
Whenever Darigaaz deals combat damage to a player, you may pay {2}{R}. If you do, choose a color, then that player reveals their hand and Darigaaz deals damage to the player equal to the number of cards of that color revealed this way.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $0.69 to $199.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Duel Decks: Phyrexia vs. the Coalition | 47 | Rare | $0.69 | — |
| Invasion | 243 | Rare | $3.99 | $199.99 |
One ruling from Wizards of the Coast
- 4 October 2004You choose the color during resolution. This means your opponent does not get to react after knowing the color you chose.