Circuit Break Single Cards

Activate this card at the start of your Main Phase 1, if you control no monsters. If any player Normal Summons/Sets a monster, that player cannot Special Summon that turn. If any player Special Summons a monster, that player cannot Normal Summon/Set that turn.

2 Level 4 monsters
Once per turn, during your Standby Phase, detach 1 material from this card. If you cannot, destroy it. This Attack Position card cannot be destroyed by your opponent's card effects. Your opponent cannot target this Attack Position card with card effects. While this card is in face-up Defense Position, change all face-up monsters on the field to Defense Position, also negate the activated effects of monsters that were in Defense Position when that effect was activated.

2 Flip monsters
Gains ATK equal to the combined original Levels of the Subterror monsters used for its Link Summon x 100. During your Main Phase: You can send 1 Flip monster from your Deck to the GY, and if you do, Special Summon 1 monster from your hand in face-down Defense Position to your zone this card points to. You can only use this effect of Subterror Behemoth Fiendess once per turn. Once per turn, if a monster this card points to is flipped face-up: Add 1 Flip monster from your Deck or GY to your hand.

2 SPYRAL monsters
This card's name becomes SPYRAL Super Agent while on the field or in the GY. You can declare 1 card type (Monster, Spell, or Trap); reveal the top card of your opponent's Deck, and if you do, and its type matches the declared type, take 1 SPYRAL monster from your Deck or GY, and either add it to your hand or Special Summon it to your zone this card points to. You can only use this effect of SPYRAL Double Helix once per turn.