Mobile Legends Karina is the powerful hero at especially one versus one. You can get enemy very fast and easy you just give huge damage. But don’t forget you will take a lot of damage, you should be careful when you come teamfight.
Karina Magic Damage Build
Firstly: Calamity Reaper

+70 Magic Power
+400 Mana
+10% Cooldown Reduction
Unique Passive – Calamity: After using an ability, the next basic attack will carry an extra 120% magic damage. This effect has a 1.5s cooldown time.
Then: Magic Shoes

+10% Cooldown Reduction
Unique: +40 Movement Speed
Then: Concentrated Energy

+70 Magic Power
+700 HP
Unique: +30% Spell Vamp
Unique Passive – Recharge: Regen 10% of one’s HP after killing a hero.
Then: Holy Crystal

+90 Magic Power
Unique: +25% Magic Power
Unique Passive – Exterminate: After a skill hits a target, magic attack will immediately increase 15%. The next skill damage will terminate this effect. This effect can last up to 3s with a built-in cooldown time of 10s.
Then: Devil Tears

+65 Magic Power
Unique: +40% Magic Penetration
Unique Passive – Spellbreaker: When HP is over 70%, the unique attribute for this equipment will increase 30%.
Finally: Blood Wings

+150 Magic Power
+150 HP
Unique Passive – Nirvana: Adds 2 HP for every 1 pt of magic power added.
Shortly Magic Damage Build for Karina

Karina Battle Spells
Flicker

Teleport a certain distance in a specified direction. For 1s. after the teleport, duration of disabling effects received will be reduced 50%.
Retribution

Deals 600-1440 pts of true damage to nearby jungle monsters or minions and increases damage to monsters by 30% within 3s (Damage will increase with level).
Karina Emblem Set
Magical Emblem Set
karina is the best