While you have any minion on the board that can attack, you can play Test Subject + double Radiant Elemental (You can play Mirage Caller to copy one) + Embalming Ritual on Test Subject + Extra Arms on Test Subject (which adds a More Arms! into your hand!) + Shadow Word: Pain on Test Subject to get spells back into your hand for the loop. You can play your More Arms! on the minion that can attack to kill your opponent.
The animation should be fast enough.