This build isn't supposed to be optimal, just funny. Don't take it seriously if you're actually trying to maximize Ashe's potential in the support role.

Want to slow people to death in lane? Want your feel like your abilities are just more auto attacks? Don't worry, Ability Haste Ashe has you covered. The items and runes you will build with this will make you forget what auto attacking even is.

Laning phase for your enemies will be torture. Enemy champions will be stunned the moment they try to attack you. It's not the most practical, but it's fun and will annoy the hell out of people.

Your W makes a great poke and harass tool during laning phase. However, your main goal with this build is to eventually be able to spam your R.

Be sure to check out my other guides!

Ability Haste
Items:
Spear of Shojin: 20
Ionian Boots of Lucidity: 20
Axiom Arc: 25
Vigilant Wardstone: 10
Cosmic Drive: 25
Malignance: 20

Runes:
Transcendence (Level 8): 10
Ability Haste: 8

Subtotal: 138

20% (Vigilant Wardstone) of 138: 27.6

Total: 165.6

Additionally...
Spear of Shojin: 15 basic ability haste
Ionian Boots of Lucidity: 12 summoner spell haste
Axiom Arc: 10 + 5.4 = 15.4% of original ultimate cooldown refunded on takedown
Malignance: 20 ultimate haste
Transcendence (Level 11): 20% of current basic ability cooldowns refunded on takedown

Volley
Its cooldown goes from 4 seconds to 1.55 seconds

2.45 second reduction
61.25% reduction

With Trascendence at level 11:
An additional 0.31 seconds at most is refunded (1.24 second cooldown)

2.76 second reduction
69% reduction

Enchanted Crystal Arrow
Its cooldown goes from 60 seconds to 20.41 seconds

39.59 second reduction
65.9833% reduction

With Axiom Arc passive:
An additional 9.24 seconds is refunded (11.17 second cooldown)

48.83 second reduction
81.3833% reduction