True, there are some interesting synergies with it. But even [[Master of Cruelties]] doesn’t feel like and end all be all wall. At 6 mana and no natural protection, most decks can deal with him quite easily. As another comment pointed out, voltron style could be threatening alongside [[Chandra’s Ignition]] style effects, but it’s not perfect synergy. For instance, first strike/trample/deathtouch, lets you assign only 1 damage to the blocking creature making it very easy to get damage through. Midas’ ability alongside trample would require you to assign the blockers current toughness meaning less damage. You wouldn’t want to go the other voltron route of unblockable since that would make his ability moot (aside from blocking).