Revealed at an event.

Machining Treehopper

Grade 0 / Trigger Unit – Critical Trigger / Zoo – Megacolony – Insect

Power 4000

Shield 10000

ACT (RC) Generation Break 1: [Return this Unit to your Deck] Choose one of your opponent’s rear-guards, and that unit cannot Stand dring your opponent’s next stand phase. Shuffle your deck.

Source