Have you read my “Guide to Stolen Purples” article?
You’re echoing a common complaint among new players. More experienced players say it’s pretty strong but not overpowered. But its strength also varies a lot depending on how you use it - I’ve had games that it did break, rendering the opponent completely helpless all game, and games where one player spammed it to steal crash gems and then choked on a pile of stolen crashes they couldn’t play.