In Yu-Gi-Oh! GX SPIRIT CALLER you collect multiple duel spirits that give your character passive buffs; to level up the spirits, their card has to be face-up on the field to gain experience when you win, nothing else.
This is actually a modified version of the structure deck
LORD OF THE STORM, summon high attack WIND/Winged Beast monsters, then use
Harpie Lady 1 for attack boosts,
Aqua Chorus to further buff
Harpie Lady 1. Play
Harpies' Hunting Ground for backrow clearing, (
Normal Summon or
Special Summon);
Card Destruction, and
Reload, for bad hands.
Now the purpose for this deck is to level up your Spirit Partner, (
White Magician Pikeru/
Ebon Magician Curran). Use
Apprentice Magician as cannon fodder to either: mill
Apprentice Magician; summon
Pikeru/
Curran to use their effects; or
Hand of Nephthys to summon
Sacred Phoenix of Nephthys as a boss monster.
Side Deck: switch out
White Magician Pikeru/
Ebon Magician Curran depending on which Spirit you have equipped. If you didn't unlock
Reckless Greed (secret pack
Thirst for Victory) I recommend
Sixth Sense (post-game pack
Deep Shadows), choose 5-6 high risk, high reward. If you unlocked
Harpie's Feather Duster (unlocked from Blair, extremely hard to get), switch out
Heavy Storm; and replace
Sixth Sense with
Reckless Greed because deck limitations for forbidden cards.
Little-Winguard option, if you want an early game monster to poke and go to defense, doesn't really have synergy with the rest of the deck.