Starry Knight Balefire

Effect

Add 1 "Starry Knight" monster, or 1 Level 7 LIGHT Dragon monster, from your Deck to your hand, then, if you control no monsters and your opponent controls a DARK monster, you can Special Summon 1 Level 7 LIGHT Dragon monster from your hand. You can only activate 1 "Starry Knight Balefire" per turn.