This is a main anti-AD build, if you were to face a AP team i would have picked "Spirit Visage" instead of "Warden's Mail".
I pick "Ghost" and "Flash" because of Amumus lack of escape abilities and with a bit of talent and some help from "Despair" you can take down eny fleeing hero.
I Pick "Boots of Speed" to begin with because of the heroes passive slow movementspeed, and with the speed rune there is almost a 0% chance of dying in FB (I haven't died once in FB with this build. The next item i pick is "Warden's Mail" because then no melee burst hero can catch him (not even shaco) and with the rune he can outrun eny hero that has movementspeed +2. The "Sunfire Cape is for ekstra dmg and the "Guardian Angel" is so the enemy cant get your Legendary killingspree without loosing some teammates.
I've picked dodge, mana reg, magic resistance and movementspeed.
Dodge because hes a lategame low health magic tank that needs to be able to take large amounts of dmg without dying and to gain a useable amount of mana would take too much time - in the meanwhile this makes you vundreble to AP attackes so therefor i pick magic resistance.
The mana reg is because of the large use of mana and low maximum mana that you need to compensate for.
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