Any advices for my Kefka Deck? (Without changing the core)

{"ops":[{"insert":"At a first glance I would guess this deck started out as a "},{"insert":{"card-link":"Nekusar, the Mindrazer"}},{"insert":" list? Overall solid. Depending on the playgroup forcing discards will make you archenemy very fast - if you get singled out maybe add more boardwipes.\nPlease replace "},{"insert":{"card-link":"Pongify"}},{"insert":" and "},{"insert":{"card-link":"Rapid Hybridization"}},{"insert":" with any actual removal like"},{"insert":{"card-link":"Terminate"}},{"insert":" and "},{"insert":{"card-link":"Bitter Triumph"}},{"insert":".\nThese cards might be of interest to you:\n"},{"insert":{"card-link":"Cool but Rude"}},{"insert":" / "},{"insert":{"card-link":"Cryptcaller Chariot"}},{"insert":" / "},{"insert":{"card-link":"Monument to Endurance"}},{"insert":" / "},{"insert":{"card-link":"Shadowgrange Archfiend"}},{"insert":" / "},{"insert":{"card-link":"Syphon Mind"}},{"insert":" .\n\nLastly you currently have only one spell to remove graveyards - which is quiet dangerous since you basically force feed any reanimator / golgari / or selfmill decks. Maybe add some more interaction:\n"},{"insert":{"card-link":"Bojuka Bog"}},{"insert":" / "},{"insert":{"card-link":"Dauthi Voidwalker"}},{"insert":" / "},{"insert":{"card-link":"Leyline of the Void"}},{"insert":"\n"}]}