Union Attack (SPIRIT CALLER)

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.

Quickly fill your graveyard with union, or high level monsters to summon later; either use Foolish Burial, or discard with XYZ-Dragon Cannon, or Damage Condenser, to summon Aitsu, or Soitsu and put their union partner in the grave. Activate Roll Out! to equip you Union-monster and gain their effect. Alternatively if you have Doitsu/Koitsu + Celestial Transformation in your hand, use that to special summon them and immediately equip them to a monster; Transformation's effect won't destroy them when Union monsters are Spell Cards, or use them to get tribute fodder for Aitsu. Stall the duel with Magic Cylinder, Mirror Force, Sakuretsu, Swords of Revealing Light.

Fall back on the X-Y-Z monsters for reliable hitters, the game doesn't have that many beatsticks, and fewer backrow removal.

Side Deck: If you haven't unlocked Monster Reborn from Atticus use Premature Burial. If you want to be more combat heavy, use The Sanctuary in the Sky; play Agido late into the game, when it is destroyed, any roll from 3-6 will summon a fairy. Use Giant Trunade, if you want to return your monsters to your hand, and use Backup Soldier if the duel is going poorly.