An Idea to Deal with Mobility Creep
New Item: Timewarper Pendant +80 AP +5% Movement Speed 2350 Gold Recipe: Aether Wisp + Blasting Wand + 640 Gold
Unique Active: Targets self or an enemy Champion, moving them back in time to where they were standing 4 seconds ago. On self cast: Additionally gains back the same health and mana they had where they were previously standing (30 second cooldown)
This item would be a great addition to mage itemization by giving immobile mages an escape tool from junglers and assassins who can lock on to them, but still remains as a situational item. Additionally, supports could utilize this item when one of their teammates is in trouble. It encourages good decision making because unlike flash, you cannot choose where you land, so if you were closer to the enemy's tower 4 seconds ago, for example, you would be in bigger trouble and more likely to die.
The reason I didn't include a AD version of this item is because many assassins and mobile characters scale off AD, which would only encourage them to buy this item as an extra escape (ex: Zed, Lee Sin, Kalista, etc.).
And yes, it would reverse blinks, dashes, and flashes.