The combo consists of playing Zephrys with an empty board with 2 mana left over (like after a Wild Pyro+Equality). In this situation, he will always give you Sorcerer's Apprentice.

Next turn, you need to have Stonetusk Boar, Faceless Manipulator, and Sound the Bells in hand. You play Sorcerer's Apprentice, you play Faceless Manipulator, copying the Apprentice, you play Stonetusk Boar, and infinitely buff it using Sound the Bells!

The deck has an OTK Paladin shell, borrowing from the likes of Holy Wrath OTK Paladin while being a singleton deck.

Hope you have fun trying out the combo?