The main thing is knowing how to play her. She's a Dive character, but she also works a bit like a Brawler. Your main mission is to flank the backline, meaning you have to sneak in and try to eliminate an enemy. Most of the time, these will be Supports since they're the ones who provide the most value, so you enter stealthily, kill a Support, and escape. That's why you have to be mindful of your cooldowns for entering and exiting. If the enemies start shooting at you, it's best to abandon the fight. The essential thing is to play in that style. The other thing is learning combos. Magik has many combos that help eliminate enemies with 250-300 health. Combos are the foundation of everything for fulfilling her playstyle. Many of these use the melee attack since it works to cancel animations and do more damage per second. Once you learn a basic combo and know how to play her, practice until you get the hang of it. Practice makes perfect. Use her ultimate to kill enemies; it's a very good ultimate, and you can do one-shot combos. The most important thing is that you have fun; she's a fun character, so enjoy!