How to make runeglaive useful on more AP junglers
AP 40>>70 CDR 10>>20 Mana same Mana Regen +100% base Unique passive- spellblade: 30% ap >> 40% ap AOE>> AOE vs Monsters, 20% Slow vs champions on basic attack>> basic attack or spell Unique passive- Runesap: Restore 6% of damage dealt as health and 3% as mana while fighting monsters.
The idea is simple. Runeglaive would be an item AP junglers would rush as cheap items. So, what we do is give it nearly the same stats as the OTHER early game rush ap item: 
. Of course, due to the AP ratio it grants, it should be slightly less valuable.
The reason many ap junglers suffer is mana issues. This was not a problem in season 4 due to spirit stone. Since that was removed, they need help on that.
The spellblade passive as it stands is just a bad idea. Just look at champions like Fiddlesticks. You want HIM to build Sheen? If he stops draining to autoattack, HE IS DEAD. If it applied to spells however, suddenly casters can use the ap jungle item.
