I instead summoners get a 20% or 25% RP bonus in Rank Battle, instead of doing this for LAND.
Each battle already requires one summoner in RANK.
Underpower (low-level) summoners already will limit the max card level you can play in RANK.
Giving a bonus in the RANK battle will help drive the value of all Summoners.
The land is better suited for cards not used in rank battles anymore.
The game should be around the playable deck and not around LAND.