Ancient Gear Knight (SGX1-END10) [Speed Duel GX: Duel Academy Box]

This card is treated as a Normal Monster while face-up on the field or in the GY. 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>• If this card attacks, your opponent cannot activate any Spell/Trap Cards until the end of the Damage Step.