Cheapest priced copy (Starter Commander Decks): $0.49 at Card Kingdom, near mint, their price list as of .
Runehorn Hellkite 
Creature — Dragon · 5/5 · Rare · Commander 2016 · #20
Flying
{5}{R}, Exile this card from your graveyard: Each player discards their hand, then draws seven cards.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $0.49 to $0.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2016 | 20 | Rare | $0.79 | — |
| Starter Commander Decks | 155 | Rare | $0.49 | — |
2 rulings from Wizards of the Coast
- 8 November 2016If a player has no cards in hand, that player discards no cards, then draws seven cards.
- 8 November 2016Exiling Runehorn Hellkite from your graveyard is part of the cost of its activated ability. An opponent can't remove Runehorn Hellkite from your graveyard in response to you activating the ability.