Hibernation Dragon
If this card is Normal or Special Summoned: You can target 1 Level 4 or lower Dragon monster in your GY; add it to your hand. While you control no Link Monsters, except the turn this card was sent to the GY: You can banish this card from your GY, then target 1 DARK Dragon Link Monster in your GY; Special Summon it. You can only use each effect of "Hibernation Dragon" once per turn.