A friend of mine introduced me to Keyforge (physical card game) which is really awesome (See my thread here)
There is a fan made online version that is really well done. The plus side of the Crucible Online, as it’s called, is that you can use your own card decks but also any other deck if you import it - you can get the code for each deck off the online database.
It would be pretty difficult for someone new starting with the Crucible online. Much better to get the physical version and start there though.