Cheapest priced copy (Eventide): $0.35 at Card Kingdom, near mint, their price list as of .
Heartlash Cinder 
Creature — Elemental Warrior · 1/1 · Common · Eventide · #56
Haste
Chroma — When this creature enters, it gets +X/+0 until end of turn, where X is the number of red mana symbols in the mana costs of permanents you control.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Eventide | 56 | Common | $0.35 | $0.49 |
3 rulings from Wizards of the Coast
- 1 August 2008The effect counts the mana symbols in this cards mana cost as well.
- 1 August 2008Chroma abilities count hybrid mana symbols of the appropriate color. For example, a card with mana cost {3}{U/R}{U/R} has two red mana symbols in its mana cost.
- 1 August 2008Chroma abilities check only mana costs, which are found in a card’s upper right corner. They don’t count mana symbols that appear in a card’s text box.