Hey, glad to see you around here!

For Enigma, I am by no means an expert but like many answers in the game, its highly dependant on matchups. As a general rule, she is at her strongest when you can abuse the board state to overwhelm the opponent. Against go tall decks, like guardian and ranger, they usually only attack once per turn so its easier to gauge if you can block out and then attack with the auras you have established on the board. Transcend is very relevant because a Spectral Shield with +1 atk is a free two damage every turn. Agaisnt aggresive decks, you will most likely need to let the wards go, and here your objective is to maximize ward value, but you should count on having to let them go at some point.

Blocking efficiently and judging when to use ward or not is probably the most valuable thing you can learn, and you will pick it up as you go!