you may want to throw in the Inkmoth Nexus and lose one of the other nonbasics (turns into 1/1 flying infect creature, and if your running green black throw in the Preators Counsel (no make hand size and return your graveyard to your hand) i would also consider genesis waves to get those wurms out faster. but i do agree with the other comments doom blades or some other form of creature kill would really help
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I'm a new player but if your deck has a lot of live gain in it you might want to invest in aoh man the name escapes me now Felidar Life Sovereign White creature 5 mana if memory serves (Text I will never forget "at the beginning of your upkeep if you have 40 or more live you win the game") that might help with you lack of win condition.
his/or her comments cost 0 mana to write I'm a new player and want all the advise I can get pos or neg just let me know what you think.