Diamond and Marvel Comics are teaming up to release a pretty cool San Diego Comic-Con 2014 Exclusive Minimates variant cover for Uncanny X-Men #23 that pays homage to the classic 1980s X-Men story “Days of Future Past”. Uncanny X-Men #23, an Original Sin tie-in, is written by Brian Michael Bendis with art by Kris Anka. In the issue Charles Xavier’s last will and testament will be discovered. But is there something concealed within the pages that might be the X-Men’s ultimate undoing? This San Diego Comic-Con 2014 exclusive is limited to 5,000 copies and can be purchased exclusively at the Diamond PREVIEWSworld SDCC booth #2401.