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

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.
<br><b>-</b> If this card attacks, your opponent cannot activate any Spell/Trap Cards until the end of the Damage Step.