Iron Knight (Ultra Rare) [BLRR-EN007-UR]

If you control "Iron Hans", this card loses 1000 ATK. If this card is destroyed by battle, or if this card on the field is sent to the GY by a card effect: You can add 1 "Iron Hans" from your Deck to your hand, or, if "Golden Castle of Stromberg" is in the Field Zone, you can add 1 Warrior monster from your Deck to your hand, instead. You can only use this effect of "Iron Knight" once per turn.