House Martell. Loyal.
Character. Cost: 7. STR: 7.

Lord.

Reaction: After you win a challenge in which The Red Viper is participating as an attacker, he gains 1 power for every 5 STR by which you won the challenge.

"Oberyn was ever the viper. Deadly, dangerous, unpredictable. No man dared tread on him." Doran Martell
Smirtouille
Core Set #109.

Link: Decklists

The Red Viper
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Rules FAQ

There is no rounding involved here. For each increment of 5 strength, the Red Viper gains 1 power. So winning by 4 strength nets 0 power, 9 strength nets 1 power, 14 strength nets 2 power, etc.