Storm Emeralda: the Forces of Nature Revealed and Tornadus Attacks for Free Tornadus, Thundurus, Landorus and Enamorus have been revealed for Storm Emeralda, sharing an Ability that wipes every Colorless Energy off their attack costs
A few additions, such as the monthly exams and the dorms, enrich the experience and keep it from being raw dueling
Cards like Talrand, Sky Summoner add a 2/2 flyer to every instant and sorcery you cast, protecting you from attacks and eventually swarming into a win condition if left unchecked
I dont think youre very likely to literally win the game with his second ability, especially as triple black is a very hefty cost to overcome, but Ring-bearers are very hard to block, so it might happen every now and again
It adds up quickly if you play consistently
Maybe the Modern meta gets so aggro heavy that this becomes relevant in something like Naya Zoo, but its pretty tough to find free slots in those hyper efficient decks whose curve generally stops on two mana