And you thought Runeglaive Ezreal was terrifying
I present you Runeglaive Garen (gif relevant)
http://new1.fjcdn.com/thumbnails/comments/4311985+_acef9bdb9e36a8f5ff769c73e995bc6e.gif
as "semi" core with two more slots to either go more tanky, more dmg or more cdr.
The only wasted stat is runeglaive's mana since the AP is converted into a mini AoE and CDR is always nice on Garen.
Watch as fools stack up armor against your spins and cut through them with your magic sword (and magic hands)
On an unrelated note: Ap Missfortune with Runeglaive is really fun to play, Runeglaive Gangplank (whatever role) Parrrleying you for 1000+ magic dmg and - for maximum overtroll - Runeglaive Nasus.