About a year ago I was clicking around on the net and I found someone's personal blog with a description of an invented card game. It was played with a normal deck of cards. Face cards were ships, and they could be augmented with shields, phasers, torpedos etc... which were represented by the pip cards. I've searched for hours and can't find it. Has anybody seen this game?
Sounds like it could be InterPlaNet War by John Buenavides. His description:
54 cards. The deck will have markings on the corners equivalent to a standard deck of playing cards. Each player takes a suit to represent his army: Martians (Spades), Terrans (Diamonds), Jovians (Clubs), or Venusians (Hearts). One card will represent your home Colony, the other 12 cards represent your Cohorts -- your combat units
And looking at the pics, the face cards are indeed marked as ships. And some of the cards reference torpedoes.
Here's his post on the BGG forums back in 2012. The links he provides to PnP files are all google drive links, though, which seem to be private now.