This clever loop centers around the twilight side of Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight, which grants your other nontoken creatures the persist ability. When you sacrifice Angel of Invention to Woe Strider's sacrifice ability, Angel of Invention's persist triggers to bring it right back with a -1/-1 counter. Fortunately, Angel of Invention's fabricate ability triggers upon re-entry to place a +1/-1 counter on it, which immediately neutralizes the -1/-1 counter through state-based actions. This leaves the angel pristine and ready to be sacrificed over and over again, fueling Woe Strider's repeatable scry engine for an endless stream of death and sacrifice triggers.