At first I thought one of the best things about this card is that it would nerf Shard of Sacrifice. But then I realized, it wouldn't do that at all, it would actually buff SoR, since the 100damage from victory would be turned into 100 healing. Maybe for that reason, the card should be changed to just straight-up grant victory, rather than deal 100damage. But of course, that would bypass dimshield/boneshield...
Miracle+Silence+Sundial+Victory might be a little bit OP, but then again, it's so situational.