*(EDITED for better reasoning)
I wouldn’t say that slightly adjusting a card as per their normal tweaking is more expensive than the time they spend on a whole new set. Nor would I call it nearly as time consuming.
If anything these things don’t intersect that much, as one is a batch of new cards which need to be played in real games to be stress tested, so they can see if more revisions need be made, Vs old hat cards which are easy to adjust in turn since they already exist and people know how they work in relation to others.
Again, these three cards are in competition for the same spot, all of them do similar things, and there is an illusion of choice as to which people will pick. It’s not simply just a case of some cards being “bad” or generally thought of as weaker. These changes would result in a wider variety of decks and play styles.
If Naga needs to be toned down it’s proc to 1 damage, and Gnasher needs to be toned down to 2 that might even be OK (though honsetly, the scaling damage is cool to me, in terms of risk Vs reward for setup, as Skorn can be played literally anywhere on the board, and both Skorn and Naga are Opening Gambit abilities)…but the topic is more how to make all three cards useful instead of creating situations where illusions of choice make for a less interesting and varied game.