This ingenious loop turns Putrid Goblin into an immortal sacrifice engine by playing two mechanics against each other: persist and +1/+1 counters. When you sacrifice Putrid Goblin to Sling-Gang Lieutenant, its persist ability normally brings it back with a -1/-1 counter, which would permanently shut off future resurrections; however, Surrak and Goreclaw's passive triggered ability swoops in to place a +1/+1 counter on the goblin the moment it re-enters, and game rules neatly cancel out the opposing counters via state-based actions. This leaves Putrid Goblin perpetually fresh and ready to be fed back into Sling-Gang Lieutenant's altar for an endless storm of life drain.