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 -- if you're looking to upload a map put it on scmscx and link it here. the dldb is... inconsistent
NudeRaider -- dydwk474
-raindance and sacrificing your firstborn. If that sounds like too much effort, just use www.scmscx.com
Heinermann