Activate Woe Strider by sacrificing Moritte of the Frost.
When Moritte of the Frost dies, its persist ability triggers, returning it from your graveyard to the battlefield as a copy of River Kelpie with one +1/+1 counter on it due to its persist ability and its static effect.
When Moritte of the Frost enters the battlefield, it and River Kelpie's first ability triggers, causing you to draw two cards.
Resolve the Woe Strider ability from step 1, causing you to scry 1.
Repeat.
This loop turns Woe Strider's sacrifice outlet into an engine by utilizing Moritte of the Frost as a cleverly disguised clone. Because Moritte enters as a copy of River Kelpie while retaining its own creature types and abilities via changeling, it gains River Kelpie's graveyard-entry trigger alongside its own native persist. When Woe Strider sacrifices this cloning trick, persist brings it right back from the graveyard, triggering the original River Kelpie and the clone's newly copied trigger to continuously draw cards.