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I'm guessing that this is a modern deck? Gates won't have much of a point till Dragon's maze comes out, may I suggest hinterland harbor and simic growth chamber, and replace greenside watcher with farseek/rangers path/cultivate/explore, any of those. Sideboard unsummon, your focus should be on getting enough mana to surprise your opponent with biovisionary, which is why cackling counterpart is a good choice, being an instant you can cast it anytime. Also Protean hulk is a good choice, sneaky way to get all biovisionarys out, but your opponent will see that coming, and might have something to exile it instead, or simply pacify it. If you want to splash a bit of black, you could kill it yourself with say, murder or devour flesh. Just a few ideas, nice start though.
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Drowned Rusalka is super inexpensive and takes care of the dilemma of "how am I going to get my Protean Hulk into the graveyard?". But I agree, having a couple more cards that help kill the Protean Hulk can not hurt. For that matter, having more Protean Hulks can't hurt.