Cheapest priced copy (Outlaws of Thunder Junction): $0.49 at Card Kingdom, near mint, their price list as of .
Colossal Rattlewurm 
Creature — Wurm · 6/5 · Rare · Outlaws of Thunder Junction · #159
Colossal Rattlewurm has flash as long as you control a Desert.
Trample
{1}{G}, Exile this card from your graveyard: Search your library for a Desert card, put it onto the battlefield tapped, then shuffle.
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
4 printings · $0.49 to $1.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Outlaws of Thunder Junction | 159 | Rare | $0.49 | $0.49 |
| Outlaws of Thunder Junction | 339 | Rare | $0.99 | $1.49 |
| Outlaws of Thunder Junction Promos | 159p | Rare | $0.49 | $0.99 |
| Outlaws of Thunder Junction Promos | 159s | Rare | — | $1.49 |
One ruling from Wizards of the Coast
- 12 April 2024The game checks whether it is legal to cast a spell before costs are determined or mana abilities are activated while casting it. If you no longer control a Desert after that point, perhaps because you sacrificed all of your Deserts while activating mana abilities, this won't affect whether you can legally cast Colossal Rattlewurm.