Unsure if it’s intended or not, but solace, which gives your creatures +maxlife based on number of life spells your creatures have, performs strangely once creatures start dying. If a creature with the trait dies, the other creatures will be completely unaffected and retain your maxlife. However, if a creature dies and is then revived, their maxlife will revert back to normal. This is the case even if the solace creature is revived as well.
tl;dr Creatures only get buffed by solace if the solace creature is alive when they’re revived