decimator web has been pretty slow, but i also think having trample on turn three is useless for this kind of deck... mutagenic growth looks decent though... thanks I have been looking for a kill spell for this deck but i couldn't think of one
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the charms are usually used in order to get rid of a lot of low toughness creatures before they can be assigned to block you bigger creatures. another use is to save a very important creature from dying this turn by regenerating. the other thing would be to get rid of enchantments like stab wound or oblivion ring and other nasty enchantments... all around a good card for saving your self or destroying an army.
definitely add in a couple of Golgari charms