Fel Infusion to heal because you should always be hitting the D.

Gathering Power because 5%+ Ability Power is ridiculous.

Fission Bomb because we need to make kills with our Living Bombs.

Pyroblast to kill off, or at the very least scare off, healers.

Chain Bomb to proliferate our Living Bomb.

Ignite to initiate team fights with a Flamestrike/Living Bomb and letting you pop off a second Living Bomb on priority.

Arcane Power so everything just dies, cries, and gives you Mana.

NOTE: You don't have a direct escape here. Your best bet is going to be D + E to stun any chasers, but you'll need to make sure you're not diving too hard or walking into anything you can't get out of. If the enemy team is using stuns, consider switching Arcane Power with Bolt of the Storm.