Agatha's Soul Cauldron / "Enduring" creature enchantment
Agatha's Soul Cauldron exploits a glitch with "Enduring" creatures (ex. Ensuring Innocence), exiling the enchantment portion of the "Enduring", even though it's not in a graveyard.
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Rezzahan#77802
commented
The Enduring creature do go to the graveyard, and remain there until their trigger resolves to bring them back as enchantments only. That is a window where graveyard hate such as the Soul Cauldron can be used to exile them and prevent them from returning.
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sparksfamilyvalues#95319
commented
The Enduring creatures have a triggered ability that brings them back as enchantments when they die. If someone activates Agatha's Soul Cauldron in response to that trigger, the creature would be exiled before it could return to the battlefield.