Boots Idea

Here's an idea: Icewind Boots +250 Health Unique Passive - Enhanced Movement: +45 Movement Speed. Unique Passive: +2 Movement Speed per second while in combat, stacking up to 35 times. The effect wears off after 5 seconds out of combat. Unique Aura: Steal 1% Movement Speed from nearby enemy champions every second, stacking up to 35 times (7 seconds in teamfights) on self, and up to 35 times on enemy champions (if you can get there). The effect wears off after 5 seconds out of combat.

Or should it be an enchantment?