Cheapest priced copy (Modern Masters 2017): $0.35 at Card Kingdom, near mint, their price list as of .
Baloth Cage Trap 
Instant — Trap · Uncommon · Zendikar · #156
If an opponent had an artifact enter the battlefield under their control this turn, you may pay {1}{G} rather than pay this spell's mana cost.
Create a 4/4 green Beast creature token.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Modern Masters 2017 | 120 | Uncommon | $0.35 | $0.49 |
| Zendikar | 156 | Uncommon | $0.35 | $0.49 |
3 rulings from Wizards of the Coast
- 1 October 2009You may ignore a Trap’s alternative cost condition and simply cast it for its normal mana cost. This is true even if its alternative cost condition has been met.
- 1 October 2009Casting a Trap by paying its alternative cost doesn’t change its mana cost or mana value. The only difference is the cost you actually pay.
- 1 October 2009Effects that increase or reduce the cost to cast a Trap will apply to whichever cost you chose to pay.