Reproduction steps: 1. Deploy champions. 2. Deploy a shadowspawn champion, for example Altered Lemure. 3. Cast masochism on it. 4. The opponent will be unaware of masochism being in play even once he starts hitting things unless he regularly goes through combat log. It's not exactly a pressing issue, but it increases the readability of the spell. There could also be some sound added to it proccing to ensure you can't just cheese it vs someone less knowledgeable via shadowspawn. @Sokolov
Doesn’t taking the damage destealth the champ? Even then, it’s a good idea to add an indicator as you suggest.