Early Laning Buy in order, taking advantage of your early weapon power and lifesteal, and a bit of durability, before adding items with a cheap and direct impact on stone form's consistancy
Early midgame Strong lifesteal sustain comes online, slowing bullets grants a lot of valuble control and then tankynes, armor, healing, and boosted speed to keep durable; you are going to be very hard to kill
Late mid game the core here is the huge damage from the intensifying mag, duration boosted. Armor is helpful and get as needed for extra sustain, PB & CD are solid, but if game allows you generally tech into t4 at this point