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I would probably go for some more "hard counters" instead of having some to counter creatures & some to counter spells. Get some that counter any spell, such as Mana Leak, Cancel, Dissipate (definitely a good option), or Syncopate. Also, Tribute to Hunger could be a removal spell worth looking into, since it can get rid of even indestructible/hexproof creatures and nets you some life in the process.
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some of the "dual shock" lands, such as Steam Vaults and Blood Crypt from the Ravnica and the Return to Ravnica would help really well w/ the Gem of Becoming, because they count as both island and/or mountain and/or swamp and you can search for them. the down side is they have a pay 2 life to come in untapped, but IMO its worth paying the 2 life for having the mana come in untapped then to be burned down cause i didnt have it on hand.