The rewards may be well worth the risk
If you do, the damage Channel Harm deals to that creature won't be prevented
It's real tough to beat down a player who can play cards multiple times regularly, and with built in protection on the commander there's not a lot to hate
on the same note, an aura commander can play out like a typical enchantress strategy with cards like Sythis, Harvest's Hand and Jukai Naturalist
The early-game removal (Conclave Tribunal and Pacifism), combined with a number of powerful life-gain effects, will allow you to make it to the mid- and late-game when you can cast any one of your 13 strong Angel creatures (including 6 rare and 5 mythic creatures!) Once you cast these powerful flyers, you will be unstoppable
Sejiri Shelter / Sejiri Glacier I use Sejiri Shelter / Sejiri Glacier as one of the more flexible low-cost ways to give a single creature protection