After all, expecting your opponent to concede while you also can't do anything is not a win condition and not the optimal way to play stax pieces
It gets even better if you build around it by playing spells you especially want to copy, but assuming you are in the right colors, Dualcaster Mage is the first card I'd put in every Naban, Dean of Initiation Commander deck I build
Curiously, this card's overly strong potential stemmed from a misprint in its ability, Mind Games
The best way of stopping Regidrago is to simply focus on removing its attackers from the game, but honestly, with all the pressure that Regidrago applies, easier on paper than in reality
There is a non holo version of each card and a holo version of each card and of course it goes without saying that Pikachu is the most sought after with his Kanto Pals Charmander, Squirtle and Bulbasaur (in that order) not far behind, although admittedly not nearly as valuable