In the past, it drastically reduced the adoption rate of cards with defense of 1000 or less, and has been used even after it was restricted
Shipping: Free International Shipping (Airmail) with tracking number takes 5 to 14 working days for North America, Asia Pacific, Europe, Middle East, about 2 to 4 weeks for Central America and South America
And the number of people looking to cash in is skyrocketing to the point where appraisal company Professional Sports Authenticator (PSA) has been forced to suspend submissions while it works through its backlog
If Sinister Serpent is not enough discard fodder, some players decide to take a page from Chaos lists and run Thunder Dragon and/or Night Assailant
You can only use 1 "Thunder Dragondark" effect per turn, and only once that turn
Wizards of the Coast wouldn't print a one-time appearance of a mechanic like Modified if it wasn't warranted