Orcust

Orcust can threaten a full combo off a single card. Every Main Deck monster — Orcust Brass Bombard, Orcust Cymbal Skeleton, and Orcust Harp Horror — carries a graveyard effect that banishes itself to Special Summon another Orcust from the hand, deck, or graveyard respectively, and each activation seeds the graveyard with a fresh piece for the next link in the chain. Orcust Knightmare extends that loop further by sending any DARK Machine from the deck to the graveyard when banished, which simultaneously loads the next resource and pumps an ally's ATK. The end goal of all this churning is Dingirsu, the Orcust of the Evening Star, reached by using any Orcust Link Monster as its Xyz material, which immediately removes a card the opponent controls and then shields your own cards from destruction by detaching materials in place of the destroyed card.

Going first is where the deck is most dangerous. The field spell Orcustrated Babel converts every graveyard and Link Monster effect in the archetype into a Quick Effect, turning the entire combo engine into interaction during the opponent's turn. Galatea, the Orcust Automaton searches out Orcust Crescendo, a Counter Trap that negates and banishes any spell, trap, or monster effect while you control an Orcust Link, and the combination of Babel and Crescendo produces a genuinely oppressive defensive posture.

The graveyard loop is self-recycling by design: banished monsters return via Galatea and Longirsu, the Orcust Orchestrator's shuffle effects, and Orcustrated Einsatz seeds the graveyard whenever the opponent summons. This keeps the engine running across multiple turns even after the opponent attempts to disrupt it, making any attempt at resource denial difficult to sustain.