new BR infect

i studied this kind of deck and i think that this is more compititive compare to other infect deck. this is how the sideboard works: valakut ramp: -4 duress,-4 virulent wound,+3 memoricide,+3 giant growth,+2 go for the throat. ub rug bug uw control: -4 virulent wound,-1 virulent swipe,+3 memoricide,+2 go for the throat. br vampire rdw: -2 duress,-4 virulent swipe,-2 explore,+2 go for the throat,+3 giant growth,+3 morbid plunder. ww quest: -2 duress,-2 virulent swipe,-2 explore,+2 go for the throat,+4 naturalize. boros quest: -2 duress,-1 virulent wound,-2 virulent swipe,-2 explore,+2 go for the throat,+3 naturalize,+2 morbid plunder. elf elfvine: -4 duress,-2 explore,-2 virulent swipe,+2 go for the throat,+4 naturalize,+2 memoricide. ub infect proliferate: -2 virulent wound,-2 virulent swipe,-1 duress,-1 explore,+2 go for the throat,+ naturalize,+2 memoricide. bg infect: -2 duress,-2 explore,+2 go for the throat,+2 giant growth. eldrazi green: -2 duress,-4 virulent wound,+2 go for the throat,+3 giant growth,+1 morbid plunder. i dont include livewire lash because it will delay your game and your opponent will easily predict your game plan(put livewire lash for 2 and equip it for 2 will delay your game, also your opponent know that what you will do next is to pump that equip creature,so before that they will kill your creature first before u can equip you livewire lash). also i change natures claim to naturalize because it can kill enchantment like mind control or journey to nowhere.. i want to build this deck so i need some help for this...comments are greatly appreciated...if you want to add something in this deck or in the sideboard, please dont hesitate to post your suggestions...thank you!!!=)