Would this version of Guinsoo's be acceptable?
Guinsoo's Rageblade
Blasting Wand (850) + Recurve Bow (1000) + Pickaxe (875) + 675 = 3400
+30 Attack Damage +40 Ability Power +15 Magic Damage On-Hit +25% Attack Speed
Unique Passive: Your basic attacks grant +5 Attack Damage, +7 Ability Power, +2 Magic Damage On-Hit, and +5% Attack Speed for 5 seconds, stacking up to 5 times. While this passive is fully stacked, you gain Guinsoo's Rage.
Guinsoo's Rage: Every other basic attack will trigger on-hit effects an additional time.
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+30 Attack Damage (1050) +40 Ability Power (870) +15 Magic Damage On-Hit (375) +25% Attack Speed (625)
Total Value at Zero Stacks: 2920 Efficiency at Zero Stacks: 85.88% Live Guinsoo's Efficiency at Zero Stacks: 74.65%
+5 Attack Damage (175 x 5 = 875) +7 Ability Power (152.25 x 5 = 761.25) +2 Magic Damage On-Hit (50 x 5 = 250) +5% Attack Speed (125 x 5 = 625)
Total Value at Max Stacks: 5431.25 Efficiency at Max Stats: 159.74% Live Guinsoo's Efficiency at Max Stacks: 139.99%
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Mostly did this because I like mathing out cost efficiency.
I considered trying it out with an Aether Wisp instead of Blasting Wand, and having it grant +5% Movement Speed too, but I wasn't sure if that would be too much.