The equipped monster's effects are negated. You can only use the following effect of "Orichalcos Sword of Sealing" once per turn. If you control a card in your Field Zone: You can target 1 Effect Monster you control; that Effect Monster gains this effect until the end of your opponent's turn.
• Once per turn (Quick Effect): You can send 1 card from your hand to the GY, then target 1 face-up card on the field; destroy that target.