The project has alot of potential and is only 5 months old. No air drops that would make you feel missing out even if you get in late. With 90% of packs still in the in game shop, it is a good time to go in and explore. There is also a good community that would help with any questions in detail. You can play immediately without any investment, but to earn rewards you need to buy creedits worth 4$ and buy two packs (one pack cost 2$ and contains 5 cards with one rare or higher). The 4$ is enough to get you running and snowballing. Although to progress faster i would suggest to get more cards in the market place or get more packs. It's very rare to find a game that would let you earn and develope your assets by just playing with minimal investment. Try it and see you around the game.