This variant is surprisingly valuable due the scarcity of PSA 10 cards as a result of print quality issue
In practice, it's almost identical to what youd do, which is cast to counter their spell, untap, and attack, making the difference nearly negligible with the big upside of having a 3/3 flying creature, which is extremely good
The bigger issue is that it can happen at all and if it can, then it would be much easier to manipulate higher demand and lower supply cards
Then, Ravensburger just announced that the next set Winterspell which adds Darkwing Duck to the mix would see a prerelease on February 13th followed by February 20th wide release
Youll mostly just hope to chain 4s with Tellah, Great Sage, but the characters iconic Meteor moment may also come up