everything multihunter said is true. but don't let it get you down. the approach you took was correct. you came up with a theme/concept for a strategy for a deck and you attempted to build around it. albeit this isn't what would be considered a "good" deck, your rationalizing and logic all made sense. the number one thing you want is consistency. 4 and 3 of most cards that impact the game the greatest and most easily in your favor. a deck focus's winning in one major way,with most decks having an "alternative win condition" if their primary strategy fails. one way this deck could work,is if you made it a proliferating deck with poison/mill cards. cards like Grindclock, Decimator Web to name a couple. then throw some contagion clasps,and maybe some viral drakes. take out most the non infect creatures unless they serve a greater purpose i.e. overgrown embattlement; it helps ramp your mana and it can be a blocker. a deck usually basically does one thing; here it is proliferate, with which you can proliferate poison/mill kind of fitting your original idea of killing them by making them focus on defending them selves from one or the other. keep at it,creativity is the greatest tool.practice makes perfect =]
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i'd suggest taking out the tarpit.8 lands that come in tapped will slow you greatly and it also isnt infect. i'd play the mistep in the main. sb lifes finale and maybe contagion clasp since you have so much prolif. from your spells. i'd say definitely get some necropedes in there,it would be amazing in this deck. i'd also try to fit in a full set of mutagenic growth.it should be in any infect deck imo. nice work though