Strangely enough, its Life Points halving effect says "Once per turn", even though there's no way to be able to use that effect once per turn, due to the necessary equipping effect happens only when it is Xyz Summoned, which means the Life Points halving effect can only be used literally just once, not once per turn. Also, it doesn't even need to say "once per turn", you literally cannot use its effect twice per turn anyway, since there is only 1 "Number" equipped to it. This is the only card in the game with such kind of misleading text.