How to push rank from bronze to silver 3?

How to push rank from bronze 1 to silver 3 ?

1 Fire summoner strong at melee fight.
2 Death summoner strong at counter mage.
3 Earth summoner Best at magic damages can counter melee.
I use fire summoner 50% to win to silver 3. Death summoner 35% and Earth 10% and
5% other summoner see the rule. Now fire is strong i think.

What card i rent?

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