Select 1 face-up non-Tuner monster that you control. If that monster is used this turn as a Synchro Material Monster for the Synchro Summon of a Dark Synchro Monster, treat its level as a negative number.
Select 1 face-up non-Tuner monster that you control. If that monster is used this turn as a Synchro Material Monster for the Synchro Summon of a Dark Synchro Monster, treat its level as a negative number.