the effect of tiamat card should not be far stronger than 5 headed dragon, but still stronger than it. it also need to take into account the Lore in FGO as beast in Babilonia singularity.
imagine after defeating five head dragon, suddenly tiamat broke into the game and become a hidden boss. and defeating her will get her card.
Yes
zouken be like :
wishing for tiamama
Heroic Spirit Deck in Yu-Gi-Oh!
Anime & Comics · ANeet0001