How can I know what an enemy team's strongest color is?

How can I know what an enemy team's strongest color is? - Photo of Bouquet Of Flowers In Can

In Marvel Puzzle Quest, the 'Surgical Strike' skill of Wolverine (X-Force), destroys all tiles of the enemy team's strongest color, doing damage per tile.

I know from experience that it is not the color with the highest AP count, so what is the deciding factor ?
The level of the character currently in front ? The most powerful skill of that character ? The 'primary color' of a character ... ?

Update: Blade (Daywalker)'s 'Nightstalker' skill also influences the enemy's strongest color.






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The best way to tilt enemy team...




Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Ylanite Koppens, Karolina Grabowska, Felicity Tai, Felicity Tai