Cast Entering by paying its mana cost, targeting any applicable target.
Holding priority, cast Dualcaster Mage by paying its mana cost.
When Dualcaster Mage enters, it triggers, targeting Entering.
Holding priority, activate Woe Strider by sacrificing Dualcaster Mage.
Resolve the Dualcaster Mage trigger, copying Entering, with the copy targeting Dualcaster Mage
Resolve the Entering copy, returning Dualcaster Mage from your graveyard to the battlefield.
Repeat from step 3.
This intricate loop leverages Entering to pull Dualcaster Mage straight out of your graveyard and onto the battlefield, where its enters-the-battlefield trigger immediately targets and copies the spell all over again. To keep the chain going, Woe Strider steps in as the ultimate sacrifice outlet, letting you pitch Dualcaster Mage to the graveyard so it’s ready to be resurrected while simultaneously feeding you an endless stream of scry triggers. As a nice bonus, if you ever need to dig for your pieces in the first place, Breaking // Entering's other half can mill an opponent right into a setup.