This examples are just there to show how expensive one time tutors are and Oneiro is a two times tutor if not countered.
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To be fair those tutors do benefit from being just as good if drawn during round 3, while Oneriomancy loses a lot of its value, also if Oneiromancy would be as expensive as including 2 tutors, which would do the same one would always include those instead, given that those could both be used in the same round (although admittedly one would have to draw both.
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-> Of course I know: If you go for witcher swarm or king roegner Geralt: Quen is the card of your choice. Also I see the symbiosis synergies with call of the forest.
-> My basic argument is that tutoring cards costs a lot of provision in gwent (can also add all those special card tutors whose tutoring basically cost 6) and that Oneio is comparable cheap tutoring for all cards if played twice. Thus, I suggested a conditional Echo.
I do get your arguments, however your calculation was off and once corrected shows a somewhat different picture.
That being said, I agree that Oneiromancy could be a bit undercosted (although only by 1 provision).
The thing is that if Oneiromancy would cost 14 provisions the price would be the following (depending on the card one would draw instead):
One would have draw a 4p card instead: (14+4)/2 = 9p
One would have draw a 5p card instead: (15+4)/2 = 9.5p
One would have draw a >=6p card instead: (14+(>=6))/2 >= 10p
In fact the comparisons you mentioned (Geralt: Quen and Call of the Forest) would then be superior at their one use, compared to the one use of Oneiromancy, in fact if we consider their utility they are already more efficient at one tutoring than Oneiromancy.
if you would however argue that Echoes being
slightly weaker during the second use would make for a more interesting mechanic, then I agree.
However in that case the second use of an Echo would still require a larger value than the average card, so that the Echo tag would not become a downside.
Shaping Nature and Ard Gaeth are already close to being a negative Echo, in the fact that drawing them again is already almost a downside.