I'd be careful before trying this in a tournament. Resetting the game without sideboards sounds less like intended behavior and more like a bug. It's possible you could be penalized (account frozen, banned) for doing this with tickets on the line, there's precedence for this.
Disclaimer: I am not an orc. (I like that disclaimer)
It's a legitimate line in paper Magic though and I know LSV did this on camera exploiting
Detention Sphere (of course, WotC would be less likely to ban him than a lesser known MTGOer).
Edit: Oblivion Ring
