Merge tactics is p2p

I did not play for a veeeery long time, like maybe, last time i played, having a legendary was so rare, i think i dropped nearly after royal ghost.

I came back from time to time but not for longer than a week or 2, recently i came back again and saw this mode that looked like TFT.

I was interested and grinded it, at a point where now, i fight people with lvl 15 cards, and mines are lvl 10 to 12, i can see that especially for higher rarity cards, that having them maxed is a huge advantage.

Like my crossbow queen lvl 11 is like 852 hp, while lvl 13 ennemy is 1350~ (both 1 star), i don't even imagine her HP at lvl 15

What do you guys think about the mode ?