Zilean Passive, Visible awesomeness

After 1 game of playing Zilean, i have decided that i love the change. its a visible passive, an active gameplay, and not just that, a game changer. Making a lvl5 Vi reach lvl 6 JUST before a gank was funny as hell. Especially when we had Bot lane (Yasuo and Zed) at lvl 4. My bot lane (me at 5 and ashe at 6) had them seriusly zoned. Then making Ashe lvl up faster than usual had them seriusly angry. And i realized the heavy strategic options it has. Imagin a teamfight gone wrong, and you have a lvl 10 Nunu in a bush close to the fight. Needing the extra help, go to nunu, level hi, up, them bait the enemy to follow toward nunus bush. with the now higher power on his Ult, Nunu turns the fight around better than he could have at lvl 10. add in Zileans own ult and Burst/CC explosions, and the fight is as good as won. This is a super great passive, and i approve. Now i only need to test it more. :)