Is the acquirable card pool big enough?

I think this game is quite promising, but i fear that the cards i'm able to get are too few or not advanced enough such that i can construct, say, multiple decks with different purposes using the same colors. To be honest i like mtg but i don't think i can get the energy to force myself through grinding just to get a way-too-simple deck that barely differs from the standard deck. Any opinions from experienced wizards on the matter?

tl;dr: dafuq why are there so little cards? Are they even gonna be fun if i throw all my money at the screen?