HP Doomsday....doomsday

The challenge here is to permanently kill/unmake/destroy HP Doomsday...BFR is NOT an option:
This is a battle in each round but each contestant will be attempting to kill Doomsday from the outset BUT NOT IMMEDIATELY AWARE of his regenerative abilities
CLASSIC VERSIONS FOR ALL CONTESTANTS ..The gauntlet contestants are

1) Sersi

2) Loki

3) Silver Surfer

4) Thanos

5) Uatu

6) Odin

7) Galactus

8) Stranger

9) Arishem

10) LT

6 and up should be able to do this once they figure it out.

Surfer could as well but DD is already his equal or superior so I don't know.

HP Doomsday is not Surfer's equal.

And 6 (albeit with some struggle) and up can do it.

Didn't Thanos turn a handful of villains to salt instantly at some point in his history?