What, no. This passive should never have existed in the first place. In fact, I'm surprised that Morde wasn't gutted even harder considering the amount of power this ability has.
"The item would be bought by any support but would give full xp to the nearest enemy champion if they last hit the enemy, but the bonus XP would only work on melee champs"
I have no idea what this even means. So I'm last hitting a minion, and the enemy gets the full xp for it? What? Talk about an unproductive item. And even if it was for the support that's last hitting the minion, that's stupid. "Sure, let's give Leona the ability to hit 6 before everyone else and CC the enemy laners ez pz." And because this item would be balantly OP, EVERYONE is going to build it, and limits the support role to just melee champions. Boom. Congrats, you now have fucked bot lane even harder. Possibly 2v1 lanes even more snowball-y.