Card effect
Every 3 times one of your heroes casts a skill, that hero permanently gains +1 level.
Skill
Spacetime Bomb
Sun Bin throws a time bomb at the target enemy that explodes after 2 seconds, dealing 50+100% magic attack as magic damage to it and enemies within 1 tile.
Upgrades
10lv
Bomb damage increased to 50+150% magic attack
40lv
Every 3rd cast throws bombs at the 3 enemies with the highest HP
100lv
Silences the target while the bomb is attached to it
Awakened card
Sun Bin
Every 3 times one of your heroes casts a skill, that hero permanently gains +2 levels.
Zhulu
Every 3 times one of your heroes casts a skill, that hero permanently gains +2 levels.
How to obtain
Source: obtained from the shop, auctions and other channels