Spellbinder

Gold 2900
Stores nearby spellcasts and can consume them to grant Movement Speed and Ability Power.

+120 Ability Power
+10% Movement Speed

UNIQUE Passive: Nearby allied and enemy spellcasts charge Spellbinder up to a cap (100 maximum).
UNIQUE Active: Gain a maximum of 80 Ability Power and 50% decaying Movement Speed for 4 seconds.

Each spellcast stored contributes +0.8 Ability Power and +0.5% Movement Speed to the effect. (60 second cooldown).
Builds From

Needlessly Large Rod Greatly increases Ability Power 1250 Gold Aether Wisp Increases Ability Power and Movement Speed 415 Gold