I cant complain too loudly about that one, as Ive definitely abused the crap out of that card
Outside of Chulane, though, I still think this is a very annoying card to play against
Each card must have a visual border that will be placed on the borders of the card
On top of that, it's also a win condition, being a conditional Opalescence
If another effect (or effects) modifies how much damage your creature with an odd mana value would dealby preventing some of it, for examplethe player being dealt damage or the controller of the permanent being dealt damage chooses the order in which any such effects (including Obosh's) apply
Cards like Harpie's Feather Duster, which is run by one of the best Yu-Gi-Oh characters, and Dark Hole do a much better job of this and don't require a discard