This elegant loop turns a simple resurrection spell into a self-sustaining engine by exploiting the interaction between the stack and creature sacrifice. You begin by casting Dread Return, then flash in Dualcaster Mage while it's on the stack so that its enters-the-battlefield trigger can copy the original spell. Before that copy resolves, Woe Strider steps in to sacrifice the Dualcaster Mage, sending it safely back to the graveyard while leveraging its scry ability. The resulting copy of Dread Return immediately pulls Dualcaster Mage right back onto the battlefield, where it triggers anew to copy Dread Return once more. By endlessly repeating this cycle of resurrection and sacrifice, you generate infinite creature entries, exits, deaths, and scrys.