How Pay 2 Win is this game?

Hey

I really like this game. Started playing it a few days ago. My record is 40-7-14.

Before I invest more time in it, is it possible to get to top tiers without spending a lot money on it?

I am fine to buy some packs (not too many though), as a support for the devs as I really think this is a cool concept of a game.

If you are already in top tiers, how much do you need to spend to be competitive?

Thanks