Try a Sparky Construct team:
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Construct in Front (By Default these units are pretty Tank, so any additional armor to them allows them to take a good beating before they can be sacrificed.
For Construct: I would choose anyone that uses Blue Mana (You’ll see why).
- Deep Boarer (R/Blue) ( Low Cost - > Good Default Stats & Used to charge up Cauldron)
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Put Sparky (Sparkgrinder) in 2nd (R/Y) → He will DOUBLE the Attack of the Construct and increase armor.
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Sacrificial Priest (P/Y) - > Use him on Deep Boarer once the construct reaches at least 75-80 attack.This coupled with his 20+ Split Damage will be able to one shot most normal to hard difficulty teams. No more than 4 CASTS are needed from either Sparky or Cauldron.
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Ranger Hero with Cauldron (G/Brown) ( Huge Life Bonus and Doubles the Deep Boarer’s Attack again)
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As for the Banner I would use Brown/Yellow or Brown/Any Color
This is all theoretical. I haven’t tried it. Just curious to know if it works in practice.