I do like this deck, and I like what you've done. Obviously, I think you should push to complete your sets of
Llanowar Wastes and
Hissing Quagmire, and drop the
Crumbling Vestige . If you really want the Vestige, then the cuts should come at the expense of basic lands.
Both
Dark Petition and
Minister of Pain should be cut from the board. In their place, for those match ups where you need to go big and be aggressive, I would play 3
Pitiless Horde, which gets got by CoCo if needed, and really brings the business to the battlefield. For the remaining two slots, I would go with
Transgress the Mind, a very good discard spell that can rip sweepers or planeswalkers from your opponents hands. Another card to consider is
Ruinous Path somewhere in the 75, as it is premium removal and takes care of opposing creatures and PW's , and can even provide a creature if needed.