This clever loop kicks off the moment you cast Cursed Mirror, letting it enter the battlefield as a hasty copy of Felidar Guardian. That entry triggers a blink of the original Felidar Guardian, which in turn returns the favor by blinking Cursed Mirror back out of and back into existence. Because Cursed Mirror resets its identity upon every re-entry, it can continuously reinvent itself as a fresh Felidar Guardian to sustain an endless, self-perpetuating cycle of entering and leaving the battlefield.