Cool deck. Deathtouch is such a ubiquitous mechanic that's its really cool to see an entire deck based around it! I also like the whole pump spells backup for when they don't block you. Along that note have you considered cards like
Become Immense to take advantage of anything that
ends up in your graveyard?
Another thing to consider is something like
Rabid Bite which causes one of your creatures to
deal damage (thus killing whatever you pick).
Finally, it's unrelated to deathtouch, but it feels like
Wild Defiance could really shine here. Makes all your guys
Lightning Bolt proof, and when you do go about buffing them, they get an additional +3/+3. Just something to think about.
I hope you find this helpful. Good luck and Happy Hunting