Recs.
Updated
Shadow Era is a free to play digital and real world trading card game that is cross platform.
Specs
Pros
Pro Very limited RNG
Aside from a handful of cards from the original set that had "at random" on them, the developers have gone out of their way to bring more control into the hands of players. Effects will specify they damage "the ally with the lowest health", for example, and on a tie there is a Standard Resolution Order (the ally closer to the hero takes priority), so always know which one will be affected. Sometimes on other games you might think the RNG is skewed/faked, but that can't happen in Shadow Era. This means the main element of randomness and luck is the shuffle of the deck, which is how a card game should be.
Pro New free Single-player Campaign mode being updated regularly
There are already 120 missions to play through with dialogue, telling the story from the very beginning, for 10 Human heroes and 2 Shadow heroes (at the time of writing). Over time, more dialogue is being added to other missions for the remaining 6 Human heroes and 14 Shadow heroes, and then more maps with more missions will be added in future. The campaign mode is completely free and gives generous rewards for playing.
Pro Over 600 cards (approx 250 legal per hero)
The card pool has grown to a very decent size, spread across Neutral, two factions (Human/Shadow) and seven classes (Warrior, Mage, Hunter, Priest, Rogue, Wulven and Elemental). Each of the 32 heroes belongs to a faction/class combination, where they can use Neutral cards and cards from the faction or class. This gives each hero access to approximately 250 cards, which allows for great variety of decks.