You really shouldn't have any mana issues with him regardless if your camping lanes or not. D:
Philostone should suffice enough for mana regen, and also builds into (Shurelya's Reverie) a team item mid to late game. Frozen heart, and Banshees Veil give a good chunk of mana, and are very strong items on him.
Philostone should suffice enough for mana regen, and also builds into (Shurelya's Reverie) a team item mid to late game. Frozen heart, and Banshees Veil give a good chunk of mana, and are very strong items on him.