Back when observatory gave CI domain, this deck did pretty well:

1 x arcen moatworks
3 x astridian diplomat
3 x cloudburst
1 x dusk efreet
3 x flash flood
3 x hailstrorm
3 x imperial stronghold
1 x magma chamber
1 x marauding puddle
3 x mogi nest
3 x observatory
3 x sleet mogi
3 x sunburst
3 x tremor
3 x zap
3 x zeppelin raiders

basic strategy is:
magma chamber, observatory
once observatory in play....
idea is to put a mogi nest as a construction site
flash flood can freeze your opponents development and then you
can start looking around and start sniping!
tremor/zap or tremor/hailstorm was a good combo