Mutually Affured Destruction

Both players must keep their hands revealed this turn. While their hands are revealed by this effect, if they both have a card with the same name in their hands, neither player can activate cards with that name, or their effects.

From Yu-Gi-Oh! Trading Card Game.

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6nqu7m4bjwsb1iwzyb8dn1.