Easy way to get 1800 ratings ?
every element has 7 mana summoner (dragon 2 cards)
we can watch their skills
Yodin-Zaku's abilities mean you should use a fire team within ranged attack.
Lir-Deepswimmer's abilities mean you should use a water team within high blood and high speed.otherwise it's can anti Yodin-Zaku's fire team.(water monsters usually with high speed.)
Scarred-Llama-Mage's abilities mean you should use a self-healing team.
Chanseus-the-Great's ability mean you should use a great tank front and behind.
Mimosa-Nightshade just anti ranged and magic attack team.
Byzantine-Kitty should use a ranged team too.but it offer more speeding.
Camila-Sungazer anti high Melee team.
these are simple way to get about 1800 ratings.
if you want to get more scores,need think much more about game balance.