Iron Knight

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.