Brian David-Marshall says, Blue-Green Madness relies almost entirely upon commons and uncommons from the Odyssey block to operate. The deck first emerged at Pro Tour – Osaka as an Odyssey Block Constructed deck when Ken Ho won that event with a Tarnished Citadel and Upheaval as his only rares. The key cards in the deck were Wild Mongrels and Aquamoebas. Those two cards allow you to exploit the madness cards Basking Rootwalla and Arrogant Wurm. They also serve as an outlet to toss Roar of the Wurm into the graveyard for a turn-4 6/6 token creature. Ken Ho played a very similar deck at the Chicago masters event. He replaced the Tarnished Citadel with three City of Brass and the Aquamoebas became Merfolk Looters—exchanging power for card selection without losing madness outlets. Read more.