Holding priority, cast Dualcaster Mage by paying its mana cost.
When Dualcaster Mage enters, it triggers, copying Demonic Gifts, with the copy targeting Dualcaster Mage.
Resolve the copy of Demonic Gifts.
Holding priority, activate Woe Strider by sacrificing Dualcaster Mage.
When Dualcaster Mage dies, it triggers, returning it from your graveyard to the battlefield.
Repeat from step 3.
Resolve all Woe Strider abilities from step 5.
This clever loop turns a simple resurrection spell into an endless cycle of magical echoes and grim sacrifices. By flashing in Dualcaster Mage while Demonic Gifts is on the stack, the Mage copies the spell to target itself, ensuring it will return whenever it meets its end. Woe Strider provides the necessary exit strategy, letting you sacrifice the Mage to trigger its return while simultaneously smoothing your draws with its scry ability.