My only suggestion is that the chimeras should be called
"Small Chimera," "Medium Chimera" and "Large Chimera."
I disagree.
Those names are fine play-test names, but they are terribly uninteresting.
"Nimble" is flavorful and implies the flexibility of the card
"Majestic" is at least an interesting word, even if it doesn't describe the abilities.
"Raging" is also an appealing name, and implies that it is an attack.
There are maybe better names, but small/medium/large and bland.
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I'm really underwhelmed by Majestic Chimera. You say a "fat wishing well", but wishing well isn't great, and this doesn't even guarantee the draw that wishing well always grants you.
If it was +card, +action, name a card, reveal 2, it WOULD be a buff wishing well, and there would be major improvements:
1) after you draw the first card, you have more knowledge about what's remaining in your deck
2) revealing 2 cards means you are far more likely to hit what you wanted
3) if you changed it to leave on top rather than discard, like wishing well, and you completely whiffed, then a second majestic chimera would draw the top card, and at least the next card as well, since you would know what it is. self synergy!
The opportunity cost to get these is VERY high. I think you can push them harder. Nimble chimera could be "pick 3", possibly with a "no option more than twice" rider. or it could come with a +action and a pick 2.
Also, it would be nice if they more synergistic as a group, for instance, wisp finds imps. What if the majestic chimera found what you called AND any chimeras that it found?
To push the raging chimera, you might make it cost less, or keep the "i get to make a choice" theme, and allow you to chose the attack, and not even make people reveal their hands.
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As an alternative to pushing the chimeras, you could lower the opportunity cost.
Here are two ways:
1) remove the hyper flavorful potion cost from meld, make it cost ~4$
2) give the meld forum's "when you buy this, +buy" ability, to make it less painful when you get a 3rd round draw of potion and 4 coppers. You might need to make the meld cost something like 1$P, to keep it from being stupid.
I really like that the meld can trash your potion for value when you are done with it. there could be additional synergy if the cost or abilities of meld were modified to allow you to trash a different meld into a chimera. the easy way to do this is to replace the potion cost.
Alternatively, there could be a chimera that had a potion in its cost. This would also create inter-alchemy synergies.