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Correct.

Flickerwisp's ETB trigger will go on the stack but Flickerwip will already be in the graveyard by the time the ability resolves.

The exiled card (Dread of Night) will return to the...

I've been playing Dread of Night as there's three D&T players in my local meta and I've just had more success with it compared to Massacre.

Dread of Night also makes it very difficult for a...

Basically fine, seems like a very standard ANT list.

Manabase is a bit weird I think something more traditional (much like your list) would be:

4 Misty Rainforest
4 Polluted Delta
1 Volcanic...