I made Top 200 Legend with Deathrattle OTK DH. Score 29-11
This deck wins with the OTK combo with Il'gynoth
In addition, this deck also plays a lot on the board, so it often takes only 18 damages to win the game.
One important thing to do with this deck is care. Don’t be afraid to play the combo pieces to heal yourself, you have so many ways to make lethal and also against some matchups ( e.g. Face Hunter, Token Druid) you can even just control and win board.
Another important thing to do with this deck is to draw with Skull of Gul'dan on outcast. So if you have Il'gynoth or too many cards in your hand and then you can’t put it in the outcast play Illidari Studies in turn 6 or Double Jump in turn 7 to try to play Skull of Gul'dan in the outcast.
VS aggro: Immolation Aura
VS not aggro: Death Speaker Blackthorn
This deck like all DH OTK is strong but very difficult to play, so if you start with some missplay don’t worry. :)