I ran a similar deck some time ago, so I think I might give some input.
I assume you are aware that
bazaar trader can permanently give you control of creatures you steal with stuff like
claim the firstborn, right? Against creature based decks this mostly is a lethal combo.
Another fun card to give your opponent is
Immortal Coil. In combination with
Shred Memory (which fortunately can also transmute into trader
), it can be an instant win sometimes. The rest of the time it is gives you some carddraw.
Another synergy I liked to use was
Abyssal Persecutor in combination with
Fling /
Thud or similiar effects (you sac Persecutor => you CAN win the game again and shoot damage in your opponents face - ideally after an attack). To support that and as removal I had some copies of
Auger Spree which would make Persecutor a 10/2 and with that lethal when attacking plus sacing for damage.
I hope you got some
inspiration from this. If you needed/wanted it, that is.