Cheapest priced copy (Guilds of Ravnica): $0.35 at Card Kingdom, near mint, their price list as of .
Hellkite Whelp 
Creature — Dragon · 3/3 · Uncommon · Guilds of Ravnica · #106
Flying
Whenever this creature attacks, it deals 1 damage to target creature defending player controls.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Guilds of Ravnica | 106 | Uncommon | $0.35 | $0.49 |
| Foundations Jumpstart | 562 | Uncommon | $0.35 | — |
2 rulings from Wizards of the Coast
- 5 October 2018In a Two-Headed Giant game, Hellkite Whelp's triggered ability can target only a creature controlled by the player it's attacking. It can't target a creature controlled by that player's teammate.
- 5 October 2018If a creature attacks a planeswalker or battle, that permanent's controller is the defending player.