Cheapest priced copy (Avatar: The Last Airbender): $0.35 at Card Kingdom, near mint, their price list as of .
Serpent of the Pass 
Creature — Serpent · 6/5 · Uncommon · Avatar: The Last Airbender · #70
If there are three or more Lesson cards in your graveyard, you may cast this spell as though it had flash.
This spell costs {1} less to cast for each noncreature, nonland card in your graveyard.
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Avatar: The Last Airbender | 70 | Uncommon | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 2 October 2025To determine the total cost of a spell, start with the mana cost or alternative cost you're paying, add any cost increases, then apply any cost reductions (such as that of Serpent of the Pass's second ability). The mana value of the spell is determined only by its mana cost, no matter what the total cost to cast that spell was.
- 2 October 2025Serpent of the Pass's second ability cannot reduce the {U}{U} in its cost.