Most of the times in Gwent, when an expansion comes out, some new cards will use the same mechanism but better and the old ones will just be forgotten and in most cases never brought up to level.
Ifrit was in the base cards, then Regis came and had the banish option on top (now it is melee locked, which for me still makes it better than ifrit but as Lexor said, yes, he has an advantage with a limitation). Then Betsy came and it ends up being the same card with additional stats/advantages. You'll see in future expansions you'll probably get another one that will purify and then do 4 damage or boost itself or something like that, making Ifrit, Regis and Betsy outdated.
Same with Harpy (base) and Bargheist (expansion). Same with a bunch of other cards...
All of that is actually what sfruzz said above: it has been powercrept. Welcome to CCG universe.
(I know it's a bit out topic but if anyone is/was a Magic player (the physical card game), the same happened. I use to play 20 years ago when a 6/6 flying dragon for 9 mana was as big as they came, then compared it to the most recent card sets where anybody could throw a 6/6 flying indestructible trample double attack whatever for less mana, or a 13/13 monster turn 3 or shit like that. Same principal. Difference is you can't update physical cards. You can (could if you wanted to) update them in virtual games.)