Nemurelia

Nemurelia opens on its Extra Deck — specifically on the face-up Pendulum Monster requirement that almost every card in the archetype references. Sweet Dreams, Nemleria searches any Nemleria monster from the Deck, and when Dreaming Nemleria is already face-up in the Extra Deck, that search resolves with a blanket prohibition on opponent responses to Nemleria summons that same turn. Dream Tower of Princess Nemleria extends that engine further by banishing two face-down Extra Deck cards to add any two differently-named Level 10 Beast monsters directly from the Deck, at the cost of locking non-Pendulum Special Summons for the turn. Recycling Sweet Dreams from the Graveyard to return Dreaming Nemleria to the Extra Deck keeps the whole loop renewable across multiple turns.

The Level 10 bodies the deck searches are largely self-sufficient on the board. Both Couette and Oreiller can Special Summon themselves from hand without a Normal Summon provided a face-up Pendulum Monster sits in the Extra Deck, flooding the field at minimal cost. With Dreaming Nemleria face-up, Couette can negate targeted effects aimed at Nemleria cards by banishing a face-down Extra Deck card, while Dream Tower provides blanket destruction immunity under the same condition, again consuming that diminishing face-down pool. Oreiller trades the same resource for a sizeable ATK boost scaled to the opponent's board, giving the deck a credible threat in battle as well as in disruption.

The face-down Extra Deck cards are the deck's central resource, and depleting them too quickly limits how many negations and protections the deck can chain together in a single engagement.