This grew out of Are questions on auto battlers on-topic?
I originally through questions about Hearthstone are obviously on topic because Hearthstone is clearly a card game. However, the answer in that question says board games must:
Be playable on or around a table
Be playable by hand, by human players implementing all of the rules
Hearthstone does not qualify because it is purely digital. I find this surprising because Magic: Arena is also a digital card game, with elements that cannot be replicated on paper (such as Momir, which has things like "summon a random creature").
I would like to clarify if Hearthstone and other purely digital CCGs like Eternal, The Elder Scrolls: Legends, etc, are on topic.