Maokai support, possibly a great pick against assassins
Maokai is a pretty good support due to his CC, vision, and team wide %damage reduction. %damage reduction can be even stronger with Knight's Vow. He can lock down assassins with his single target CC and targeted snare. In addition, duskblade doesn't disable the saplings, since they're minions and not wards or traps. Edge of Night can be popped with his low CD Q (4 seconds at max rank) or his E.
What do you guys think? Would you rather just have a different support?