Ascension: Storm of The Souls (ASOTS) is a deck-building game, akin to Thunderstone and Dominion. Players build a custom deck with in-game currencies like the aforementioned games, but ASOTS is simpler, and looks and feels more like the original source of inspiration, Magic: The Gathering. Another major difference is that ASOTS has more randomness in deck-building.
In both Dominion and Thunderstone, the card market is randomized in fixed sets, allowing players to see all the cards available for deck-building. In ASOTS, only six cards are available for purchase and the rest are revealed as cards are bought. Thus, one cannot fully plan card mix strategies, rather one must acquire cards tactically, carefully watching the card purchases of other players.