As a Supp who wishes their Bot Carry's would pick more Mages like Ziggs Id suggest Veigar.

His power comes from farm and PvP combat which is excelled against multiple targets.

He's not hard to learn and his stun is hyper useful.

His biggest flaw is being an immobile squishy which would be compensated by having a Support in bot lane.

So please consider adding this or another similar Mage to your Bot Carry pool because we all know how much people love their AD Fighters and Assassins in Top, JG and Mid.

P.s. He's uber fun.