Firstly, i start with a tear of the goddess. It gives you some good mana and mana regeneration. Then I take the boots, and make the tear of the goddess to a manamune, which is quite cheap and can give quite a lot of attack damage. After that, i buy the warmog' s armor which,with Feast, gives a huge increase of maximum health. Then, with all that health, atma' s impaler will just greatly increase your attack damage and also gives armor and critical chance. The last two items, which you' ll probably won' t be able to buy in every game since they may not last so much, are frozen mallet, which further increases your damage and wit' s end, to have some more attack speed and magic resist. Also, wit' s end passive works quite well with vorpal spikes, increasing your damage a lot. Also, nashor' s tooth or hextech gunblade work equally well.