If this card is Normal or Special Summoned: You can discard 1 card; apply the appropriate effect, based on the card type discarded. You can only use this effect of "Mystic Huldra" once per turn.
• Monster: Add 1 Trap from your GY to your hand.
• Spell: Add 1 monster from your GY to your hand.
• Trap: Add 1 Spell from your GY to your hand.