Its not a big secret that collectible card games have always been a way to get people to spend a lot of money on cardboard, or in this case, digital cardboard. This can make them pretty inaccessible to new players, considering they need to drop a bunch of money upfront to be competitive. It also means that anyone with less time or money than the average player will be at a disadvantage.
But Legends of Runeterra does quite a bit to prevent this.
Source: N4G PC 9 ways Legends of Runeterra is built for the casual free-to-play market