It is "no dice" for a casino in Toronto, an idea firmly squashed yesterday by both Mayor David Miller and Ontario Premier Dalton McGuinty. At city hall, several councillors urged the mayor-controlled executive committee to look into the feasibility of a Toronto-owned gambling operation, in part to raise revenue. After a brief, heated debate, the committee killed the request put forward by Councillor Cesar Palacio (Ward 17, Davenport), who is not a member of the executive.