The first unit that was removed was a Transmogrifying Flamer, so I assumed that the reason I didn't draw a card and gain a life was because of an interaction with it's own last stand ability. After that I had a Pack of Bloodletters and a Slashing Screamer removed by my own abilities, and a Reckless Juggernaut and Insatiable Bloodreaver removed by my opponent.
Correct on the information for the Transmogrify Flamer, as for the other cards that is strange.
Thanks for providing this info, I'll see what I can chase up