What's the best way to give my creatures deathtouch?

I'm working on a casual blue-green-red deck that revolves around pingers like Cunning Sparkmage and Razorfin Hunter. I'd like them to get deathtouch. I've seen Nightshade Peddler, but a Gorgon's Head might be a little harder to remove. Also, a multi color card that gives my critters deathtouch would help my Lobber Crew, but I can't find anything like that. Does it even exist?