Voice of the blessed
When you have a luminarch veteran in play, and you play a voice of the blessed, it enters and then you gain life and then you get a +1/+1 counter on it. That’s great. Then if your opponent exiles it with a brutal Cathar it gets exiled. If you play a skyclave apparition, or your own brutal cathar, you now have two enter the battlefield triggers. As the player who controls those abilities, you should be able to order them however you want. However, even in full control mode, it doesn’t let you. It should allow you to stack the skyclave apparition’s exile trigger to resolve before the life gain trigger, so that by the time the life gain trigger happens, if you have exiled the brutal cathar trapping your voice of the blessed, it will be on the battlefield by the time the life gain trigger resolves, granting it an additional +1/+1 counter. Instead, the game defaults to resolving the life gain first, so the voice of the blessed isn’t back on the battlefield to see it.