Use Disintegrate (Q) to farm mineons. Save up your stun to harass opponent. Then walk to your opponent and use your Incinerate (W) to harass even more. If jungle comes to gank then stun your opponent.

If your fed you can take the roll as a carry and deal as much damage as possible, but if you are under fed then try no to die and get more defensive items. After you have picked up your Tibblers (R) use it as a stun to deal as much damage as possible.

After you got quite a bit of Ability Power then your Incinerate will be able to destroy full mineon. In teamfight try to burst down AD Carry and AP Carry at the same time as you AoE all enemies for full effect.