This clever loop turns Kithkin Spellduster into an immortal sacrifice engine by playing on the precise interaction between its persist ability and Stalwart Successor. Whenever Kithkin Spellduster enters the battlefield with a -1/-1 counter from persist, Stalwart Successor steps in to place a +1/+1 counter on it, which immediately neutralizes the -1/-1 counter through state-based actions and clears the way for the process to repeat. Meanwhile, Woe Strider acts as the catalyst by feeding on Kithkin Spellduster’s repeated sacrifices, granting you infinite scry triggers and fuel for whatever payoff you desire.