You can get this only from the Bishop's Opening and it doesn't appear in chess.com game explorer but the engine gives a plus to the first player so it can't be too bad. Maybe it's an idea to use for your games too.

The move d6 makes this something other than Evans, and the b4 offer now reaps insufficient benefit.

Nh6 was a blunder; Black has other options.

It seems weird that a variant like this is not played at all, it doesn't seem too bad overall at least as a surprise weapon  

It is interesting, but the 'surprise' is really black playing 3...d6 in the first place, instead of the the usual 3...Nc6. Still, it seems like a logical continuation. I found the game Staunton-Cochrane (1842!) where white played 4.d4 instead, and also won.

It's a common response at patz level: in my case 3 times black played Bb6 the other time I got a good position with the gambit accepted and Ba5 but then the blunder came. The main move in the explorer after d6  is Nc3 

isnt it just going into this

http://www.chess.com/opening/eco/C23_Bishops_Opening_MacDonnell_Gambit

with nf3 and d6 thrown in? 

the only thing I can say is that without Nf3 you can play these lines too

..

..

And there is the McDonnell double gambit : Mongredien managed to draw vs Morphy with it

looks interesting...but yeah unfortunately blck plays Nf6 instead of d6 and it transposes into the rusty ole guioco :(

"taking the f4 pawn is quite safe, and most probably best" .......  I had a fixation a few years back with idea of 2.Bc4 followed by the f-pawn push as soon as possible. It sounds good, like a transposition of a KG, but it usually just dropped a pawn.

Or another try at reliving the glory of the "romantic era" of chess with the MacDonnell Gambit......