def METHOD_NAME(self):
    """
    Call to create a circuit with gates that implement the MCG up to a diagonal gate.
    Remark: The qubits the gate acts on are ordered in the following way:
        q=[q_target,q_controls,q_ancilla_zero,q_ancilla_dirty]
    """
    diag = np.ones(2 ** (self.num_controls + 1)).tolist()
    q = QuantumRegister(self.num_qubits)
    circuit = QuantumCircuit(q)
    (q_target, q_controls, q_ancillas_zero, q_ancillas_dirty) = self._define_qubit_role(q)
    # ToDo: Keep this threshold updated such that the lowest gate count is achieved:
    # ToDo: we implement the MCG with a UCGate up to diagonal if the number of controls is
    # ToDo: smaller than the threshold.
    threshold = float("inf")
    if self.num_controls < threshold:
        # Implement the MCG as a UCGate (up to diagonal)
        gate_list = [np.eye(2, 2) for i in range(2**self.num_controls)]
        gate_list[-1] = self.params[0]
        ucg = UCGate(gate_list, up_to_diagonal=True)
        circuit.append(ucg, [q_target] + q_controls)
        diag = ucg._get_diagonal()
        # else:
        # ToDo: Use the best decomposition for MCGs up to diagonal gates here
        # ToDo: (with all available ancillas)
    return circuit, diag