Item Concept: Zeal + Sheen Item
I've always felt that Triforce serves to, after damage of course, increase a player's movement speed for either closing a gap or widening it, depending on the champion using it, thanks to the Rage passive. That being said, I've always felt that it falls off in the late game because full AD scaling wins out. That is fine for most champions that do use it, because they are earlier game champions that use the lead earned with the item to oppress weaker foes through their other items.
That in mind, however, I've always felt that late game champion could sync well with a spellblade item, if it scaled well with their damage.
For that reason, I came up with this idea to propose:
Ranger's Blade- 2800g (550g+ Zeal+ Sheen)
+30% Attack Speed +30% Critical Chance +250 Mana +10% Cooldown Reduction +5% Movement Speed
Unique Passive: Spellblade- After using an ability, your next basic attack deals (100% AD)(+1 per 1% Critical Strike Chance)((+1 per 1% Bonus Critical Strike Damage) bonus damage.
What do you guys think?

will increase this damage to 375 if it crits. now add on ad which an adc has around 250-350 depending on items. add the crit multiplier for a whopping 625-875 damage. dont forget your normal auto damage with an infinity edge crit
max level 160 magic damage
max level 120 magic damage. the damage can crit and do 700 magic damage together. this adds up to a max of 2825 mix damage. this will go through armor and magic resist damage reducers but will still do a lot of damage. if reduced by 70% (a tank) it will do 848 damage. without the sheen autos do 473 damage. so this item takes into account crit and makes crit champs bursty with sustained damage. i do not find this balanced and wish to keep them different.
strong in particular, he would build this as his first item and have such a early game powerspike.