So Nasus and Zz'rot...
Don't know if this is already known or whatever, but Nasus can essentially sit in front of a Zz'rot portal and farm up creatures with his Q, (which comes off cooldown everytime a new minion spawns) and get stacks as though he was farming minions. An unaware Zz'rot carrier can, unintentionally, give nasus over a hundred stacks from one Zz'rot portal or more. Seeing as how this could take out the risk all together of a Nasus having to go to minions to stack and considering they don't give gold or any other benefits (for other champions) this seems broken as all can get out.