Cheapest priced copy (Zendikar): $0.35 at Card Kingdom, near mint, their price list as of .
Ravenous Trap 
Instant — Trap · Rare · Double Masters · #103
If an opponent had three or more cards put into their graveyard from anywhere this turn, you may pay {0} rather than pay this spell's mana cost.
Exile target player's graveyard.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
3 printings · $0.35 to $5.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Double Masters | 103 | Rare | $0.49 | $0.49 |
| The List | ZEN-109 | Uncommon | — | — |
| Zendikar | 109 | Uncommon | $0.35 | $5.99 |
One ruling from Wizards of the Coast
- 7 August 2020To determine the total cost of a spell, start with the mana cost or alternative cost you're paying (such as Ravenous Trap's alternative cost), add any cost increases, then apply any cost reductions. The mana value of the spell remains unchanged, no matter what the total cost to cast it was.