I use a Nightmare & Roots deck:
Cutey Dieter Oshitsune Timmy Gretchen Lilly Miken Moose Rico
Maybe you can get to top 150 with it, but win with this is not happening.
If you want to be succesful in DT you have to play quick, and ko opponents, to move on faster. This deck is not for that. You can have fun in DTs with it even get to top 150, but this simply don't have what it takes to be a DT monster deck.
Heal and posion might be a bit slow to base a DT deck around.