This is why I hate the 1.0 version of Succor/Evacuate (the 1.0 version of Egress sucks too).
Succor costs 300 mana, then on top of that it siphons 700 mana from your entire group. I only use it when I absolutely have to.
https://web.archive.org/web/20010823...ell.asp?Id=974