Think Terramorphic Expanse would help? Those tri-lands aren't helping Coalition of Victory at all - coalition needs basic land types. I'd run more basic lands and some land finders like Terramorphic Expanse or the guy that costs 2G and finds a land when he comes into play, he's a 2/2.
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Have you tried Giant Growth in it? Maybe a Feral Throwback or two? Canopy Crawler?
What could I add for defense or improvement?