Amumu Synergy?

I was looking at items and masteries for Amumu and I thought of something and want to see if it would actually work.

Basically, I'm wondering since Despair proc's Rylai's if it wouldn't be good to have the mastery Oppression, and Liandry's.

Amumu would, with Despair active, receive 3% less damage and Liandry's would deal 4% of an enemies current heatlh per second due to it dealing double damage to movement impaired champions. Liandry's should proc off Despair and off Tantrum, and with the combination of Abyssal Sceptor and Sunfire Cape, Amumu could just literally just run around destroying people without ever really touching them.

Rylai's gives health and AP in addition, as does Liandry's with the bonus of Magic Pen, so I see them as items that, alone, could be considered good for Amumu simply due to the stats they give.

I was curious what people would think of this, so please give me your feedback on your ideas of using these items for synergy.