Here's what I would suggest: Since most of your cards are modern, it would be easier to stay modern and replace the Legacy cards. That way, you avoid all the Legacy BS like
Force of Will Draw-Go or Turn 1 wins.
Here's a decklist that would be fun and still viable:
4
Abrupt Decay (Good spot removal against opponent's noncreature permanents)
4
Thornweald Archer (2 mana 2/1 with Reach and Deathtouch)
4
Ambush Viper (2 mana
Flash 2/1 with Deathtouch that can caught people off-guard)
4
Deadly Recluse (Same as
Thornweald Archer)
4
Vampire Nighthawk (3 mana 2/3 with Flying Deathtouch and
Lifelink, it slices and dices)
4
Viridian Claw (Equipment that give your creatures First Strike)
4
Narnam Renegade (1 mana cheap Deathtoucher)
3 Mwonvuli Beast Token (3 mana creature that tutor for Deathtouchers)
3
Fetid Imp (Flying and can pay mana to become a Deathtouch)
4 Veridian Longbow (This is the key to this deck being nuts, Equip this to a Deathtouch creature and you can machine gun opponent's creature to death)
So the idea would be to have Deathtoucher that can hit air. Give them first strike and the ability to ping to kill creatures, and run that way.
If you want a more expensive version, slide in
Aether Vial,
Thoughtseize and
Inquisition of Kozilek.