Infinite +1/+1 counters on most creatures you controlInfinite creature ETBInfinite creature LTBInfinite death triggersInfinite creature sacrifice triggersInfinite scry 1
How it works
Activate Woe Strider by sacrificing the persist creature.
When the persist creature dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
When the persist creature enters, Cathars' Crusade triggers, putting a +1/+1 counter on each creature you control.
Resolve the Woe Strider ability.
Repeat
This clever loop uses Woe Strider as a reliable sacrifice outlet that also lets you manipulate your library with its scry ability whenever you feed it a creature. The real magic happens because Cathars' Crusade watches every creature enter the battlefield, stacking a permanent +1/+1 counter on your entire team each time. By repeatedly sacrificing a creature that returns via persist, these two enchantments and creatures feed into each other to grow your board infinitely while triggering endless entry, exit, and death events.