Xiphon, Chrono-Mage

When you cast Xiphon, Chrono-Mage, put a lightning counter on all creatures target player controls. When Xiphon, Chrono-Mage leaves the battlefield, destroy all creatures with a lightning counter.
Rewind 5 (During your end phase, put a rewind
counter on this card. When this creature has 5 rewind counters, return it to it's owners hand.)
Hexproof, Flash