Odion's highest defense monster is a Giant Axe Mummy with 2000 Def. However, it can't do anything after you special summon your Gate Guardian. You can check more details and information regarding the deck by clicking the link below!
Summon the unhappy girl, or rai-mei if you don't have her, and pass the turns to stall the duel until you can perform the gravekeeper vassal and union attack combo. Once you summon the unhappy girl, set rai-mei again once you have enchanted javelin to raise your LP. This will make sure Odion won't attack, otherwise pumpking with castle of illusions to deal more than 5000 damage with 3 monsters.
I can confirm that it DOES still work, I run Unhappy Girl with Piranha currently. Problem is that Giant Axe Mummy can avoid the affect of Unhappy Girl's stall by flipping face down and back up again. So drop BEWD as quickly as possible to truly stall the board, he has no response to it at level 40.
So I just tried it again, purposely giving the opponent (a standard duelist) the chance to attack while I only had UG on the field, and they didn't bother.
It may just be because of the event that they made Odion more aggressive.
Did he attacked with Mummy? If yes, it's because of mechanic change announced a few months ago where UG can be cancelled with flipping face down. Hence AI attacks since they know they can always flip out of it.
you don't have to attack his mummy over and over. If you hit with unhappy girl once he will flip down yes but it's still locked (that happend with me last time i checked, don't know if any update has changed anything).
An update change that. Now flipping down cancel UG.
I always thought it works this way though, even before update. And so I did so poorly in 1st Yugi Muto event because I'd attack sphink/golem/statue over and over every time they flip and usually that make me lose control of the board. (only had 2 UG at the time and no other deck to farm.)
My point is, maybe it's a 'fix' to the mechanic?
Unlucky at All
OMG! Finally, after 5 months of farming Odion, I got my first Millennium Scorpion. I'm really happy! :'D