For those who don't know, Themberchaud is an adult (500-600 years old) dragon that lives in the "Underdark" near the city of Duergar
However, its important to remember that Declaration in Stone exiles tokens without leaving Clues behind
Card Set(s) -TWO LEGENDS- [OP-08] CARD VIEW OP08-112 | SR | CHARACTER S-Snake Attribute Special Block icon 2 Effect [On Play] Up to 1 of your opponent's Characters with a cost of 6 or less other than [Monkey type, up to 1 of your Leader or Character cards gains +3000 power during this battle
Any card that is banned in Legacy should rarely be considered safe for Modern, and especially so when the combination that got it banned in the first place exists in its unfettered form
It is a convenient method for people who want to search while comparing, or proceed from purchase to shipping all together.
If your opponent does manage to recover (like top decking an Uxie or Professor Oaks New Theory), Judge or Lookers Investigation can keep them off balance