If you have ever seen a monster being used at a lower level than is owned on an account, it is likely due to the current league being played. Monster cards are limited by the level of your selected summoner, while your summoner cards are limited by your league.
In order to locate information about what the summoner level caps are for your league, click on the Leagues button (as shown above)
You will be redirected to a screen showing the leagues and their rating ranges (shown above). Select the league you would like to view the limits of.
As the example image shows, when clicking on the silver league icon, the maximum allowed levels for each rarity of summoner are as shown:
- Common - Level 5
- Rare - Level 4
- Epic - Level 3
- Legendary - Level 2
To translate this data and find what levels of monsters you can summon, you will want to visit the stats tab of your summoner after selecting the summoner card from your collection page.
Circled in green within the above screenshot are the columns indicating the levels of common, rare, epic, and legendary monsters allowed by your summoner, and what level caps for each rarity of those cards are depending on the level of the summoner possessed.
Note: If you possess multiple copies of a summoner, then the highest level of that summoner will always be prioritized for use as long as it is not on cooldown, being delegated out, or being rented out on the market.
Normal foil versions of a summoner are only prioritized over gold foils if your normal foil summoner is available as a higher level copy than your gold foil card for play.
If you would like to learn more instead on how to increase the level of your cards, please click on the provided link for more information.