Seriously though, I would probably go with one of the vanillas from Legends. Even Isamaru has good uses as a low curve beater. Since your friend seems to have applied the stipulation that it can't be vanilla or french vanilla, maybe Axelrod Gunnarson, Gosta Dirk, Ur-Drago, Lord Magnus (you get the idea), Riven Turnbull, or any number of Legends from the really old sets.
The answer is Xenagos Ascended which is literally unplayable
Seriously though, I would probably go with one of the vanillas from Legends. Even Isamaru has good uses as a low curve beater. Since your friend seems to have applied the stipulation that it can't be vanilla or french vanilla, maybe Axelrod Gunnarson, Gosta Dirk, Ur-Drago, Lord Magnus (you get the idea), Riven Turnbull, or any number of Legends from the really old sets.