Cheapest priced copy (Outlaws of Thunder Junction Commander): $4.99 at Card Kingdom, foil, near mint, out of stock, their price list as of .
Eris, Roar of the Storm 
Legendary Creature — Elemental Warlock · 4/4 · Mythic · Outlaws of Thunder Junction Commander · #41
This spell costs {2} less to cast for each different mana value among instant and sorcery cards in your graveyard.
Flying, prowess
Whenever you cast your second spell each turn, create a 4/4 red Dragon Elemental creature token with flying and prowess.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $4.99 to $7.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Outlaws of Thunder Junction Commander | 5 | Mythic | — | $4.99Out of stock |
| Outlaws of Thunder Junction Commander | 41 | Mythic | $7.49 | $5.99Out of stock |
4 rulings from Wizards of the Coast
- 12 April 2024The mana value of a split card in the graveyard is the total mana value of both halves of that card. It does not have two mana values.
- 12 April 2024Spells that were cast before Eris entered the battlefield count. If Eris was the first spell you cast this turn, the next spell you cast this turn is your second spell.
- 12 April 2024The mana value of a double-faced card in your graveyard is always the mana value of the front face.
- 12 April 2024If the mana cost of a card in your graveyard includes {X}, X is 0 for the purpose of determining its mana value.