This card was so strong that every deck needed to have a counter for it, but the best card to deal with Mewtwo-EX in Pokmon was Mewtwo-EX itself
On the other hand, it is a single-color deck with simple mana management, and because the game speed is fast, it is hard to run out of time, making it the most recommended deck for beginners
So Panharmonicon isn't the source of the second trigger, it's whatever the original source was triggering a second time
It also adds in the insurance of not allowing creatures to be regenerated, unlike Overwhelming Forces
The best Wilds of Eldraine cards are the stuff of legends - which is very fitting given the setting of fairy tales and myths that makes up the Magic: The Gathering plane
Since Poisoned and Burned use markers, those dont affect other Special Conditions