Who currently publishes the American science fiction magazine in which Impossible Dreams by Tim Pratt was first published?
Impossible Dreams:  It was first published in "Asimov's Science Fiction" in 2006, and subsequently republished in Pratt's 2007 collection "Hart & Boot & Other Stories", and in the 2012 anthology "Other Worlds Than These". Asimov's Science Fiction:  It is currently published by Penny Publications.
Penny Publications