Hello!
Yupps, so I was at Ah Soo yesterday to take part in the weekend tourney, and this situation came up.
I was left with one card in hand, A Beast King Barbaros. I could not do much considering my opponent had 3 backrows and 2 monsters on the field; Karakuri Shogun mdl 00 "Burei" and one other one.
Instinctively, I just set the Barbaros. After that, I pass the turn. Then he used Burei's effect to flip Barbaros. That's the part where it gets tricky. I told him Barbaros is at 3000 now. But the whole situation felt weird to me. Then I somehow came to the conclusion that I could not set Barbaros. So I said I misplayed and gave game to him.
When I went home, I checked the effects and apparently you could set it. Stupid me.
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Beast King Barbaros, Level 8
You can Normal Summon or Set this card without Tributing, but its original ATK will become 1900. You can Tribute 3 monsters to Tribute Summon this card. If you do: Destroy all cards your opponent controls.
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So my question is, Barbaros attack will be at 1900 when battle position changed right? Cause I have a feeling it is.