Holding priority, cast Dualcaster Mage by paying its mana cost.
When Dualcaster Mage enters, it triggers, targeting Faith's Reward.
Holding priority, activate Woe Strider by sacrificing Dualcaster Mage.
Resolve the Dualcaster Mage trigger, copying Faith's Reward
Resolve the Faith's Reward copy, returning Dualcaster Mage from your graveyard to the battlefield.
Repeat from step 3.
This delightfully recursive loop uses Faith's Reward to bring back everything we've sacrificed, letting us endlessly chain spells and sacrifices. The engine is fueled by Woe Strider, whose sacrifice outlet not only feeds the loop and triggers its own scry ability, but also provides a way to bin our creatures right back into the graveyard. When we cast Faith's Reward, dropping Dualcaster Mage in response allows its enters-the-battlefield trigger to copy the very spell that just put it in the grave, ensuring an endless supply of copies and returning the Mage to the battlefield each time to start the cycle anew.