You can discard this card; add 1 "Golden Castle of Stromberg" from your Deck to your hand. If this card is Normal or Special Summoned: You can target 1 card in your opponent's Spell & Trap Zone; destroy it. You can only use this effect of "Glife the Phantom Bird" once per turn.
The searching works both ways for these 2 cards. Glife the Phantom Bird searches Golden Castle of Stormberg from your deck, while Golden Castle of Stormberg can special summon Glife the Phantom Bird from your deck triggering his effect.
Return Glife to the hand with these effects so that you can resummon him to use his effect. Use Harpie Dancer’s effect to return Glife the Phantom Bird back to your hand and Normal summon him again to destroy an opponent’s Spell/Trap card. Boost Mist Valley Shaman’s attack by returning Glife the Phantom Bird to the hand.
After Discarding Glife the Phantom Bird to search Golden Castle of Stormberg, you can revive him by tributing Dragunity Darkspear.