You can use Cavern Harpy to activate Circu's ability a lot of times.
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You may use Norin the Wary to have a human coming into play every turn. And Splinter Twin have a lot of uses to.
You mean put Sprouting Phytohydra in place of Mossdog. I don't like the Plant Elemental. Not look so good. Maybe Mosstodon be more aggressively. But I liked the deck.