[Photon Question] How do i go about hosting a room that isn't controlled by anyone?

I am trying to make a card game like hearth stone been using photon and everything was going ok, but then i hit a snag. I have been sort of programming it in a way where it kind of like peer to peer where one player is the master client, the second player is just a client. The problem it cause that if a player play a card that deal damage to all minions and trigger both player minions death effect. The enemy minions death effect like summoning a minion or something wont repose back fast enough.

So i decided that i need to reprogram it form scratch (again). Where one room which is the master client runs all the game logic and when the two player joins that room all they can do is send RPC. How do i go about doing this and wont this take up 3 CCU? I have a general idea how to do this, but it might make cheating easier for the host side. As well i don't like the idea of running the game twice one for hosting and the other to play in the room.