Eternal Yorick Ghoul ARAM [Gameplay]

Just played a game of ARAM. The enemy team (red side/north side) had a Yorick. From the first time he cast his Green Ghoul, once it was "killed" (lifebar depleted) it just stayed around. Only one did, but if he were to summon another green ghoul, it would appear and die as normal while the original one would stay around. It was targetable and it could do damage but it could not be killed. Abilities could affect it, i.e. cc. Minions would not advance down the lane, it could attack a turret without end (turrets would not attack it, minions would). It could follow and damage champions and slow them if they were close enough to it. Very unfun to play against.