Dazzle is a ranged intelligence support hero. He is currently one of the most popular support picks in competitive Dota, where it seems his potential as a support has finally been realised after years of being underrated.
With good healing capability, the ability to grant effective immunity from death to either himself or an ally for 5 seconds, and a tremendous minus-armour ultimate, Dazzle can be a very high-impact support hero in the right situation.
Skills
Poison Touch is skilled and maxed last.
Shallow Grave is skilled and maxed second.
Shadow Wave is skilled and maxed first.
Weave is always skilled (levels 6, 11 and 16).
Items
Starting Items: Courier and/or Observer Wards, Tangos, Healing Salve, 3x Iron Branches, Clarity.
Early Game: Observer Wards, Flying Courier, Boots of Speed, Magic Wand.
Core Items: Arcane Boots, Mekanism.
Luxury Items: Drums of Endurance, Force Staff, Eul's Scepter of Divinity, Urn of Shadow, Medallion, Aghanim's Scepter, Scythe of Vyse, Heaven's Halberd.
Situational Items: Gem, Snetry Wards, Dust (detection), Smoke (ganking), Vladmir's Offering (melee cores), Necronomicon (pushing line-up), Ghost Scepter (anti-right click), Pipe of Insight (if didn't build Mek).