I'm close to quitting Photon... Shuffling Cards

@UniquelyTama9 I think how I've set mine up may help. In my multiplayer rooms, each player has a team color, 'faction' they're playing as, their username, and their rank. Whenever any of this changes, the request goes to the master client, and then he processes it, and then the master client sends out what is on his screen to everybody else. So I think I've how done that is similar to how you need to sync your cards across every player's screen.

I put the players' data into an object[16]. Then I call an RPC, putting that object into the RPC, and send it to everyone else. Then they 'unpackage' that object and use it to update their screen. Here is what the master client sends:

public void SendFullRoomStatus()
    {
        object[] playersdata = new object[16];

        int x = 0;
        foreach (var e in playersInRoom) {
            playersdata[x] = e.userID;
            x++;
            playersdata[x] = e.team;
            x++;
            playersdata[x] = e.government;
            x++;
            playersdata[x] = e.Rank;
            x++;
        }

        photonView.RPC("UpdateRoom", RpcTarget.All, playersdata);
    }

And here is what the receivers do with it:

[PunRPC]
    void UpdateRoom(object[] RoomStatus)
    {
        playersInRoom.Clear();

        for(int i = 0; i <= 12; i += 4) {
            if (RoomStatus[i] != null) {
                PlayerInRoom newPlayer = new PlayerInRoom() {
                    userID = RoomStatus[i].ToString(),
                    team = (Team)RoomStatus[i + 1],
                    government = (Government)RoomStatus[i + 2],
                    Rank = (int)RoomStatus[i + 3]
                };
                playersInRoom.Add(newPlayer);
            }
        }

        UpdateUI();   
    }

So if I'm reading your post right, you need to take all of the information about each card, put it into an object, and pass that object into the RPC. As you can see, my multiplayer rooms have 4 players, and 4 attributes for each player, which ends up being 16 pieces of data that need to be sent. Similarly, if you have 52 cards, and just one piece of information about each (the 'value'), you can make an object[52] and put in all of that information. The other players can unpackage that object and use it to make sure their cards are shuffled similarly as well.