Ancient Gear Knight (GLAS-EN029) - Gladiator's Assault Unlimited

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