Since Winter's Guile automaticaly shatters frozen targets, i think it could lean more into stasis by refunding melee energy on shatter damage and/or kills. Stasis shards already refund melee energy but seeing as the exotics buff only lasts 5(?) seconds more energy wouldnt hurt. It would be a sort of stasis version of Dawn Chorus and would also have its place on prismatic (which i personaly believe lacks exotic diversity on warlocks). I can already think of paring it with conditional finality for its Stasis shot for some fun synergy!