Not sure if anyone here cares, but Magic: the Gathering just launched its new online platform,
MTG Arena, in open beta to coincide with the latest set release. It's supposed to be more Hearthstone-y and user friendly than clunky old MTG Online (which will also continue to exist in parallel for the foreseeable future). And like Hearthstone, it's free to play and at least theoretically possible to grind hard enough to build a competitive deck without spending any money. Do with this information what you will.