The monster with the most powerful effect is Exodia the Forbidden One. If you can gather all 5 pieces, you can declare an automatic victory.
The monsters with the highest printed ATK are Five-Headed Dragon and Dragon Master Knight (5000 ATK).
The god cards are even more powerful, but they are not permitted to use in real duels.
^is not correct all correct. there was a promotion through shonen jump that gave away tournament legal god cards.
Chat with our AI personalities
there is not really a "most powerful" card in yugioh. it all depends on the circumstance and how you use it.
Assuming the defending monster is also in attack position, both monsters will be destroyed.
Five-Headed Dragon.
Unless the monster specifically says otherwise, it takes two tributes for a monster of Lv7+
yes its name is dark blade