Red Dragon Archfiend/Assault Mode [CRMS-EN004] Ultra Rare Extreme Force its effect cannot be activated

its effect cannot be activated this turn

Set: Ancient Sanctuary Card type: Continuous Spell Rarity: Common Attack: 0 Defense: 0 All face-up Level 4 or higher monsters on the field are changed to Defense Position and remain in Defense Position as long as this card is active

Set: Duel Terminal 4 Card type: Synchro/Effect Monster Rarity: Ultra Rare Attack: 2350 Defense: 1600 1 EARTH Tuner + 1 or more non-Tuner EARTH monsters While this card is face-up on the field

Set: Dark Revelation Volume 3 Card type: Effect Monster Rarity: Rare Attack: 900 Defense: 0 If this card attacks a face-down Defense Position monster

you can also Xyz Summon this card by using a "tellarknight" Xyz Monster you control as the Xyz Material

Red Dragon Archfiend/Assault Mode [CRMS-EN004] Ultra Rare Extreme Force its effect cannot be activatedSet: Crimson Crisis Card type: Effect Monster Rarity: Ultra Rare Attack: 3500 Defense: 2500 This card cannot be Normal Summoned or Set. This card cannot be Special Summoned except with "Assault Mode Activate". If this card attacks, destroy all other monsters after damage calculation. When this card on the field is destroyed, you can Special Summon 1 "Red Dragon Archfiend" from your Graveyard.