Problem: There aren't any item that got any tricky use, with other words currently most items are flat and don't generate any greater suprise against the opponent.
Boots of mobility (1k)+Zeal (1,195k)+400=2.595k gold
Unique passive: Enchanted movement 3.5
Unique active: creates 4 illusions (non-targetable yet targetable, like the urf ghost) going like a + where the user is among 1 of the 4 illusions, the + movement pattern can be twisted accordingly to where the user clicked, duration 2 sec to travel 400 yards (can't cross walls or any other terrain but can still cross minions), reducing damage taken by 20% while preventing the user from doing anything else during the duration, CD 90 seconds.
The item wouldn't have the stats of zeal, zeal is only used as an illustration of the mirror images because zeal usually illustrates speed along with mobility boots yet the user would give up their maximum movement speed in order to be able to create 4 mirror images (like the urf ghost at the halloween SR) where 1 of those mirror images conceals the user. The purpose with this item is simple, confuse the enemy yet but still be vulnerable. Some stats could otherwise get adjusted if it isn't cost effective enough. If giving up the mobility unique passive is too much, change the required boots to swiftness instead.
1% movement speed is minimally 3 movement speed, 8% from zeal would then mean a minimum of 24 movement speed, the unique passive: enchanted movement speed 3.5 would in this case mean 100 increased movement speed when boots of swiftness actually increase a player's movement speed by 90 movement speed.