If that is what you want, you might be better served with creatures/permanents that enter and do something (most likely killing a creature) and then you can use shattergang for more control later.
Ravenous chupacabra is one of the better ideas of a creature that does that, and you've already made mention of
solemn simulacrum.
Other good includes would be cards like the new omens, the black and green ones in particular,
Omen of the dead and
omen of the hunt are both useful on their own, can sacrifice for effects, or be sacrificed as needed by your general.
A gatherer search for r/g/b/colorless and "enter's the battlefield" would be most helpful for you. I highly recommend it! Shattergang is a lot of fun!
Edit: You may not want mass land destruction, but I highly recommend some in order to stop broken lands from coming around and biting you in the keister.