Phatim - Champion idea
I was thinking of a permanent semi-transparent champion. They distort the area around them so you can see if you look hard enough. Balancing for this would be if the champ stays in one spot for too long ( roughly 5 seconds) they show up on the enemies mini-map with vision of the spot.
The champ's ult would posses the targeted enemy and allow control of them for roughly 3 second or 2 casts worth (no ult using) after the possession ends the champion that was possessed gets teleported to a spot that they get to choose while they were possessed. The possessed champion is also immune to damage to avoid the "I'm going to walk you into the tower to kill you ult."
Q - small aoe pillar of damage
W - hands come from ground to slow.
E - minion only ability where they become possessed and attack other team (mini-ult)