Card effect
When an allied unit's shield is broken, deal magic damage equal to 10% of that hero's max HP to nearby enemies (1-second cooldown).
Skill

Panacea of Change
Bian Que throws potion bottles at the 3 units with the lowest HP percentage; they shatter and leave a potion pool for 5 seconds. Allies in the pool heal 20+60% magic attack per second, while enemies in it take 20+60% magic attack as magic damage per second. Stacks.
Upgrades
10lv
Potion damage increased to 20+90% magic attack; healing increased to 20+90% magic attack
40lv
Number of potion bottles increased to 5
100lv
The potion grants allies 40% attack speed and reduces enemies' attack speed by 40%
Awakened card

Bian Que
When an allied unit's shield is broken, deal magic damage equal to 20% of that hero's max HP to nearby enemies (1-second cooldown).
Zhulu
When an allied unit's shield is broken, deal magic damage equal to 20% of that hero's max HP to nearby enemies (1-second cooldown).
Cards that grant this

Poison Support
Gain 1 Cai Yan and 1 Bian Que. When fighting together, Bian Que always casts his skill on Cai Yan; Cai Yan gains 50% move speed and keeps roaming near enemies dealing damage (see skill panel).
How to obtain
Source: obtained from the shop, auctions and other channels