There are probably 5 or 6 currencies to track in the game, so I didn’t really bother with rank until I figured out why people Snap (and action in the game to double the bid of cubes).
There’s actually an informative help page at How do Ranks work? — MARVEL SNAP Help Center
You will earn Cubes for winning matches, and lose Cubes if you lose or retreat from a match.
In general, you need 10 Cubes to go up a rank.
Example: If you’re Rank 22, once you earn 10 Cubes, you’ll go up to Rank 23
Every 10 Ranks is part of a Tier.
Ranks 11-20 are part of “Iron Tier”
Ranks 21-30 are part of “Bronze Tier”
Each time you reach a new Tier for the first time in a season, you will earn a new Reward!
At the completion of every season, players are moved down 3 tiers from where they finished the season. For example:
Rank 76 Vibranium player is dropped to Rank 40 Gold to start the season
Rank 52 Platinum player is dropped to Rank 20 Bronze to start the season
Rank 33 Silver player is dropped to Rank 10 Iron to start the season (Players cannot be reduced below 10 Iron)
Rank 155 Infinite player is dropped to Rank 70 Master to start the season (Players in Infinite always drop to Rank 70 Master)
I wish I had read this before, I wouldn’t have tried as hard to get to Rank 110. 