You have enough health regen to spam ur spells whenever the cooldowns of ur spells allow to do that.. also you have enough movement speed to avoid easy ganks.. u have to play carefully and take wards for the junglers.. also with this build you can have enough magic resist to avoid enemys mid harash.. u can own mid easily. late game u are enough tanky to survive a teamfight. hourglassh is pretty cool when u use all ur spells and u have to wait for cooldowns.also its a tanky item with enough ability power. sunfire cape is really op with ur shield spell caus is double damage. thanks for reading this build. hopefully i helped you