My favorite thing to do with effects like this one is changing the target of a counterspell to Imps Mischief
One of the standard payoffs for opponents drawing extra cards is you drawing an extra card, which you can do with piggyback cards like Faerie Mastermind, The Council of Four, and Trouble in Pairs
Also Nuclear Fallout is super sweet wipe in the deck that can actually double as a (somewhat janky) finisher since they will (eventually) lose an extra life each time we proliferate their rad counters
You can't make them concede or have them agree to an intentional draw
Even without building around it, it leads to long, non-deterministic turns with little opportunity for fruitful interaction
Only time will tell how much of this hype is the result of legitimate demand, and how much of the value is being inflated by a small group of buyers