You can invest cards without playing and you don't even need a starter pack to buy cards on the market. My investment idea is for example accumulating lots of creepy oze and hold for at least 1 year. As I'm sure that it's a useful card because it's 1 mana card and it's a neutral card which you can use it with any team. This card is also limited. When all creepy oze cards will be distributed after this l think that price will rise at least 2 x.