Sword of the Divine [Item Concept]
Sword of the Divine obviously has been in the game before with two different versions, one was a semi on-hit item (it did bonus magic damage after so many attacks) and the other was a weird burst assassin item that could not be balanced and was exploited on certain champions and never bought on others. My idea would be more on the lines of a different version of its first iteration.
Sword of the Divine: Recipe: Recurve Bow (1000g) + Zeal (1300g) + 300g = 2600g
Statistics: +40% Attack Speed +30% Critical Strike Chance +5% Movement Speed +UNIQUE Passive: Every 5th attack deals (50 to 150) bonus magic damage which can critically strike.
Runaan's Hurricane will stack the passive faster, but only the main basic attack applies the damage; of course scales with level. This item will be the single target bursty item, firecannon the siege and poke item, shiv the AoE-bursty item, and hurricane be the AoE-sustain damage item.