Talk:Demonic Dragon of Demise, Azi Dahaka/@comment-13275021-20150111112102

The answer to the mystery of how to call a size 4 monster has been revealed in the manga! It's indeed via a spell card.

Kyoya: "I will surpass the limits!! Spell card, Dragon Throne!!"

Caption: "It seems even a size 4 monster can appear now."