Spoiler Spotlight: Shilgengar, Sire of Famine 

Angel of serenity has more uses then to exile your own stuff to get the counters of them. its a 2 text effect so they dont go on the stack at the same time. so if you play/reanimate angel of serenity , then target 3 opponent creatures , then sacrifice it in response to the ETB the the 3 cards will just get removed. because of stack order 1. Sac resolves , putting AoS into grave 2. LTB triggers but has nothing to return since the ETB has not resolved yet. 3. ETB resoves exilen 3 cards (which will never return since AoS allready left the battlefield) this works because the ETB and LTB are seperate instances. and you get the blood tokens

Youre the only person I've seen that pointed out that Shilgengars mass reanimate ability is instant speed. That's by far the most powerful part of him. If WotC had put their stupid "activate only as a sorcery", I wouldn't have built this deck.