Cheapest priced copy (Journey into Nyx): $0.35 at Card Kingdom, near mint, their price list as of .
Quarry Colossus 
Creature — Giant · 5/6 · Uncommon · Journey into Nyx · #22
When this creature enters, put target creature into its owner's library just beneath the top X cards of that library, where X is the number of Plains you control.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.35 to $0.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Journey into Nyx | 22 | Uncommon | $0.35 | $0.79 |
3 rulings from Wizards of the Coast
- 26 April 2014Quarry Colossus's ability is mandatory. If you control the only creatures when that ability triggers, you must choose a creature you control (which could be Quarry Colossus itself) as the target.
- 26 April 2014If there are fewer than X cards in that player's library, put the creature on the bottom of that library.
- 26 April 2014The value of X is determined as the ability resolves. If you control no Plains at that time, put the creature on top of that library.