Work in progress scars of Mirrodin cube that focuses on using cards from the scars block with a few cards from original Mirrodin and a few outlier cards based on the plane of Mirrodin/New Phyrexia.
Edit: At the moment I'm happy with the size and list of this cube. There are still cards I would like to test and rotate in and out but for the moment I would like to call this complete. I plan on keeping the size 300 and may rotate in cards like "darksteel or blightsteel Colossus" so treasure mage can have a few more targets and then add other small stuff like "reshape" for example which is a card i should add i just forgot existed.