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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Symmetry -- I dreamed about that as a kid. The idea of a computer capable of analyzing a starcraft map and calculating the fastest possible way to hit the victory condition
NudeRaider -- NudeRaider
NudeRaider -- Oh_Man
Vrael -- perhaps there is a small professional player trapped in a box in the server rack where pluto is running? hmm?
Zycorax,
O)FaRTy1billion[MM],
Symmetry