You can Tribute Summon Red-Eyes Black Dragon for 1 less Tribute for each monster your opponent controls. You can discard 1 Spell, then apply 1 of these Skills (but you can only use each of these Skills once per Duel).
• If you control a Red-Eyes Black Dragon , inflict 800 damage to your opponent, also Red-Eyes Black Dragon you control cannot declare an attack this turn.
• Fusion Summon 1 Fusion Monster that mentions Red-Eyes Black Dragon as material, using monsters from your hand or field as material, and if you do, it cannot be destroyed by your opponent s card effects until the end of this turn.