Shadowverse

That’s why they introduced an algorithm in Hearthstone that, if you get a legendary card that you already have in your collection, automatically replaces it with another one (you won’t even notice). Considering that you can only have one legendary card in your deck, there’s no point in having two copies.

Added 1 minute ago
Also, I never had the patience to start saving up for the next pack when the previous one was released. Probably because opening packs is one of the most enjoyable things about collectible card games for me.