Kelbek the Ancient Vanguard

If a card(s) is sent from the hand and/or Deck to your opponent’s GY (except during the Damage Step): You can target 1 opponent’s Special Summoned monster; Special Summon this card from your hand, then return the targeted monster to the hand. If this card is sent from the hand or Deck to the GY: You can send the top 5 cards of each player’s Deck to the GY, then, if “Exchange of the Spirit” is in your GY, you can Set 1 Trap from your GY. You can only use each effect of “Kelbek the Ancient Vanguard” once per turn.