This heroic deck looks awesome! The Phytoburst and Hexproof additions are a great fit.
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I made a deck based off of this set-up (Had to accommodate for missing cards) and I've had a ton of success with it so far. 1V1 and FFA are both easy to manage with this deck because of it's quickness and ability to stack your counters along with Heroic. A lot of fun so far. Thanks for laying the groundwork!