Celtic Guardian + Gatekeeper → Dark Elf

Celtic Guardian + Dark Artist → Dark Elf

Celtic Guardian + Fireyarou → Flame Swordsman

Celtic Guardian + One-eyed Shield Dragon → Sword Arm of Dragon

Celtic Guardian + Cyber Soldier of Darkworld → Cyber Soldier

Celtic Guardian + Wicked Dragon with the Ersatz Head → Sword Arm of Dragon

Celtic Guardian + Sonic Maid → Musician King

Celtic Guardian + Yaranzo → Armored Zombie

Celtic Guardian + Takriminos → Sword Arm of Dragon

Celtic Guardian + Yamadron → Flame Swordsman

Celtic Guardian + Three-legged Zombies → Armored Zombie

Celtic Guardian + La Jinn the Mystical Genie → Dark Elf