Sauron, Guardian of Evil

All of your creatures gain Shield (Whenever this creature is dealt damage, this creature gains +0/+X until end of turn where X is equal to how much damage was dealt divided in half rounded up to the highest number)
New Evolution (If you control Xahna, Earthen Nightmare, Anusara, Pathmaker, and Sauron, Guardian of Evil, exile them and meld them into Xanuran, Embodiment of Nightmares)