With this ability, the player either gains a three-card advantage, or drags their opponent toward slowly (but surely) milling their decks, which leads to an instant loss if the opponent has no more cards to draw at the beginning of their turn
With the current system you always know when you have all the information
At Collectible Madness, we see thousands of collectors investing in sealed products and graded cards every year
However, if you get a lot of characters on the board by somewhere around turn 4 or 5, you can exert them all and then play Olaf, Happy Passenger, so you have a beefy card to back up anything you lose when your opponent challenges you
While they might have some varying results based on your control group and whatever the meta looks like at the time, there's no denying how strong they can be
That said, this seems unlikely, and if it does happen, I imagine it will be more the fault of Emrakul than anything else