Magic stones without a magic stone type cannot be recovered in any way as long as their controller doesn't control a J/ruler with "Millium" in its name.
or : Until end of turn, non-battle damage that would be dealt to you by sources you don't control becomes 0 instead.
Flavour:
A scale from a dragon that stopped the Return of the Dragon Emperor.
or 
: Until end of turn, non-battle damage that would be dealt to you by sources you don't control becomes 0 instead.