There are some cards that let you draw and discard at the end of turn, so ending the turn would prevent the discard
Blackmail This is the locked version of Mire's Toll
* Clear Organization: Modular design makes it easy to swap decks between different boxes
You can also extend the concept by playing cards like Mizzix, Replica Rider, Vega, the Watcher, Keeper of Secrets, and Flaming Tyrannosaurus, which reward you for playing cards from any zone other than your hand
Cost reductions are really helpful in doing that too
Ultimately, this is a placeholder solution so that more time can be spent on fingerprinting and identifying headless browsers (EG: via how they do font rendering) so that the challenge proof of work page doesn't need to be presented to users that are much more likely to be legitimate