[Ricop522]

pawn Код:

if(strcmp(cmd, "/godmod", true) == 0) 
{
    if(GetPVarInt(playerid, "GOD") == 0)
    {
        SetPVarInt(playerid, "GOD", 1);
        SetPlayerHealth(playerid, 99999);
        //mensagem
    }
    if(GetPVarInt(playerid, "GOD") == 1)
    {
       SetPVarInt(playerid, "GOD", 0);
       SetPlayerHealth(playerid, 100);
       //Mensagem
    }
    return 0x01;
}


//public ONPlayerdeath

if(GetPVarInt(playerid, "GOD") == 1) SetPVarInt(playerid, "GOD", 0);

A sua array OMG й global.
O correto й
new omg[MAX_PLAYERS];