Regeltext

"Red-Eyes Black Dragon" + 1 monster that mentions "Dark Time Wizard" Must be either Fusion Summoned, or Special Summoned (from your Extra Deck) by Tributing 1 face-up monster on either field during the turn a monster(s) was destroyed by the effect of "Dark Time Wizard". You can only Special Summon "Red-Eyes Black Dragon Exceed" once per turn this way, no matter which method you use. If this card is Special Summoned: You can Special Summon 1 Level 8 or lower monster from your hand or GY. Unaffected by your opponent's activated monster and Spell effects.