Serpent of the Pass is a uncommon Creature — Serpent card from Avatar: The Last Airbender (TLA), collector number 70. Current market price: $0.08 (foil $0.27), TCGplayer market prices via Scryfall.
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.