How do I use Sirona's Touch?

when one of your units is hurt and you controll that wonder it will have acess to the sirona's touch spell. it will heal it 15 or 20% and can only be used on one unit every turn
 
Yeah, I know that. I've built the wonder and now I'm trying to get my Saverous healed but I don't know how to activate the spell :(

When Saverous is injured, you will get an icon of a blue angel among its options, click it and it will heal 15%. I'm not positive it works on undead, so that might be the issue.
 
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