I admit, I've been dorking about in the practice room with an Esper build playing both Seeker AND Homunculus, which I'm sure makes me some kind of Vintage hipster ;)
Not doing anything particular to get value out of him other than play Night's Whisper, plus Yawg's Will. Just a handy little beater, who also allowed me to cut a land, which in these post-Gush days feels quite a luxury against other blue decks. Not saying it's fantastic or anything, but I like the little blighter. With only one lonely Monk in my deck, I've got to beat down with something...
Baral meanwhile I've been playing in a more controlling Slaver style build, but that's another story!
Only just come back to MTGO after a break over the summer... will run some of this nonsense through the leagues and report back. Happy to admit, The Homunculus is probably more a fun/pet card. But life we would be boring if we didn't occasionally try these things!