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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Ultraviolet -- NudeRaider
NudeRaider -- @https://staredit.net/381291/ There's no need, as long as the original author is credited in some way (aka you're not trying to steal his map) you're fine.
dumbducky