Since it can target creatures as well as players, you can use Undying Flame to slowly get rid of all the creatures on your opponent's battlefield
Once you have that loop going, you can use Walking Ballistas ability to put counters on Necrotic Ooze, and then remove them with Walking Ballistas other ability to kill your opponent
What is the official way to do it
It requires minimum setup, and its very hard not to win a game on the turn you cast it
Images of the previously announced Lightning-type Tyranitar were revealed in Japanese, but an official translation is not yet available
The idea of him in my mind was someone who came and brought winter with him (representing the difficulty supporting large numbers of creatures) and then when enough time and seasons happened he became aware of what he was, and began his planeswalking