At high X Magic Online tries to create the copies, struggles, gives up and restarts the game. It seems to be game-state depending how high "too high" is.
Support Forum Thread
Forum Post:
Screenshot
Currently Unconfirmed.
Please provide a list of affected cards
Affects: [Doppelgang]
Card Images
Forum Post: https://forums.mtgo.com/index.php?threads/how-to-report-and-upvote-bugs-and-exploits.1739/
What is the expected behaviour of the card?
What is the actual behaviour of the card?
Support Forum Thread
Forum Post:
Screenshot Currently Unconfirmed.
Please provide a list of affected cards Affects: [Doppelgang]
Card Images