Shen Reowork Twilight Assault to be AD

"Shen's next 3 attacks deal a percentage of their target's maximum health as bonus magic damage. If the spirit blade collides with enemy champions, those attacks deal more damage and have +50% attack speed."

There are tons of items that would support AD shen rather than AP Shen. I cannot see what the "NEW" Shen would build to make him reach his full potential. There are so much AD items that allow him to do that these items are example that would extend Shen to his Maximum

"next three basic attacks to deal damage based on a portion of his target's max health" 3 times of that + this

i cannot see what AP items benefit the rework IMO he wont reach his full potential and would feel underpowered because he does not scale with AD. On top of that he is melee champion. I do not see him do well with Crystal Scepter or any AP item. Not to mention that Rod of Ages would be waste for him cause he spends money on mana so it doesn't make sense