None.
I think this was mentioned some time ago in earlier threads/posts, you CAN'T, I repeat, CAN'T change the terrain with an Extended Unit Death Trigger. 

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Moose -- Thinking on it more, I vaguely remember it being annoying because it kept repeating some short loop of the Super Mario World theme LMAO
Oh_Man -- I thought i remembered an old mario map but i searched super mario starcraft on utube and i couldnt see anything cept UMS
IskatuMesk