Ancient Gear Knight (SR03-EN009) - Structure Deck: Machine Reactor Unlimited

This card is treated as a Normal Monster while face-up on the field or in the Graveyard. While this card is a Normal Monster on the field, you can Normal Summon it to have it become an Effect Monster with this effect.
- If this card attacks, your opponent cannot activate any Spell/Trap Cards until the end of the Damage Step.