As of 2/29/2024, the Ranked Battle System has been overhauled and league limits for summoners no longer exist. Read the Official Announcement here https://peakd.com/splinterlands/@splinterlands/splinterlands-ranked-battle-overhaul
What Does Leveling Up a Summoner Do?
Instead of gaining abilities and stats when leveled up, Summoners can call forth higher-level Units at each new level. Increase the level of your summoner by combining cards.
Unsure of where a summoner falls? Click on a summoner within the Splinterlands Market or your inventory. Next, locate the Stats tab. At Level 5, Prunda Undervesch is a Common dual-element Summoner that can call forth Level 3 Rare Units.
Summoner Level With Unit Interaction
If you are unable to use a Unit at the highest level available with a specific Summoner, you will need to increase the level of that Summoner by combining cards. A warning mark sign with the text will be shown on the affected Units.