If you don't have any immunity champ then LC is best choice. Otherwise Magik all the way. Her power control is best in game.
Magic is one champ to help you become uncollected. Go face Hyperion a few times. He will help you decide if Magic’s power control is worth it. Definitely dupe her.
Rank Magik but don't use the gem. Try using your 3-Star version (I assume if you have one and sig. ability awakened?).Then decide.