I'm not sure if there has ever been a study completed on this but I believe it to be an appropriate question with practical relevance to card counters.

Assuming a casino is cheating by removing aces or tens, at which cheating point (how many removals of high cards) on a SD, DD, 6D, and 8D game would the advantage a proficient card counter has vanish entirely and give the card counter a -EV game?

Is there a combination of cards removed from the deck by a cheating casino that would still not completely nullify the card counter's advantage?