Try playing verry aggressive, land as manny baleful stikes on champs as possible early game to ensure a fast rise in AP. Always keep 70 mana left for ganks, a well placed stun will make your adc happy in any case.

When your adc is at base or dead try to last hit as manny minions with your q to get as manny stacks as possible.

Best skill combo:
high health champs: E+W+Q+R
low health champs: E+W+R+Q