What's the use of Twisted Fate Blue Card?

Twisted Fate Drizzt is one of the heroes in League of Legends. His English name "Twist Fate" can also be translated into twisted fate. He is an AP hero with many unique skills. Drawing cards and big moves made twist a frightening hero. The choice between magic recovery and more damage, AOE deceleration and moderate damage, or dizziness plus a little damage,

The blue card is mainly his W skill, which can change the color of the card in his hand, and different colors correspond to different functions.

The blue card deals 40/60/80/100/120 (+1ad) (+0.9ap) magic damage to the target, and recovers 50/75/100/125.

The red card deals 30/45/60/75/90 (+1ad) (+0.6ap) magic damage to the target and enemy units around the target, slowing down by 30/35/40/45/50% for 2.5 seconds.

Gold card deals15/22.5/30/37.5/45 (+1ad) (+0.5ap) magic damage to the target and stuns the target11.25/1.5.