Like @Wharflord said a good rainbow team could be: Brienne - Valen - Hawkmoon - Balthazar - Bane
Use +ATK troops over +DEF ones
Pick at least one in that order (regular only):
- (1) The one who buff Attack
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Brienne
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- (2) The ones who decrease defense
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Ulmer
-
Valen (4)
-
- (3) The ones who heal
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Belith (5)
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Hawkmoon
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- (4) The ones who deal the most damage with fast specials
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Balthazar
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Bane
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Berden
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Nashgar
-
- (5) The ones who dispel, if needed
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Tyrum
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- (6) The ones who increase your defense, if needed
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Kailani
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Gunnar
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Bonus - Friar Tuck:
If you need to double/triple greens you could put Friar Tuck near Brienne and Ulmer/Valen and fire his special with to fill their mana faster and have a better +ATK / -DEF uptime.