In a format where speed is everything, the ability to generate a big threat without spending mana opens the door for explosive turns
Most of the time you want the thing you are countering gone and so them just getting to cast it again next turn is rather tedious
Finally, with so many uncommon Planeswalkers costing four mana, two- and three-drop creatures get a bit better (since you can use them to protect or pressure Planeswalkers) and more expensive cards get a bit worse (since theyre competing with your Planeswalkers on curve or come down after your opponents Planeswalkers)
The real nastiness comes when you have some way to cheat the cost of the spell, and get it out early
Then, if the enchanted creature dies, you get to return this enchantment to the battlefield at the beginning of the next end step
Dissatisfied Customer | Illustration by Yangtian Li Custom MTG proxies are cards that resemble Magic cards