[RD/KP03] Dragon Merchant

Is it a Dragon that’s a merchant, or a merchant that sells dragons?

Dragon Merchant
LIGHT/Dragon
Level 4
ATK 1000/DEF 500
[Requirement] Send 1 card from your hand to the Graveyard.
[Effect] Choose 1 face-up monster on your field (Level 6 or lower/Dragon-Type), it gains 500 ATK until the end of this turn.
-Rush Duel-

Source.