While the looming 150 damage from an EX will come into play in ND, we must remember that Zekrom and Reshiram- EX both require a 3 Energy drop (2 Basics and a DCE) to pull this off
The stacking tins, for example, are released bi-yearly
With the second lore counter, it either returns an artifact from the graveyard to hand or draws a card
They were made available in the Japanese set with VMAX Climax, but that set has not been released in Europe
That sort of power is tough to argue with, which is why Mithril Coat has become almost a must-have card for commander decks
That emotional pull, combined with limited availability and strong demand in Japan, has kept prices high over time and secured the card a strong position among modern Japanese collector releases