I have listed this deck under OTK Paladin, although the one-turn combo is not a kill, but more like a checkmate.
I've got this idea from https://www.hearthpwn.com/decks/1221422-immovable-taunt-guide-included, but that deck tried to do too much imo, so this is my take on it and so far I have had good successes (although I have to admit still at a low rank atm).
The Combo: you make sure Immortal Prelate and Silver Vanguard have died (Deranged Doctor is some extra icing, but can be necessary in some matchups!). You play Da Undatakah and give it taunt with Sunfury Protector. Depending on the order in which Da Undatakah gets his deathrattles, you either have an immovable taunt minion immediately or the next time you play it. This is because he will keep recruiting himself after death.
Now, I hear you say "but what about silence/transformation effects?", and this is a fair point. However, the inclusion of two spikeridged steed and Lynessa helps to bait out the silences, if they are even run right now. So far I have been silenced only once against a disrupt Warlock who ran two spellbreakers (allongside demonic project/gnomeferatu/rin).
Potential changes: I am still not sure whether I prefer Deranged Doctor or Plated Beetle. Both have there up and downsides. Feel free to swap one for the other.