Meh. I'm in partial agreement. The only problem with this is that the amont of electrum is determined by the card you get
I'd like to dispute that to a degree. I've won 3 grey nymphs, the second one came with 1200 coins and the third came with 300 coins.
What the first grey one had I have no clue but i can assure you that it wasn't close to any of that. It was my second nymph ever (got a grvity nymph on my first day playing and on the third day playing the game i got the grey nymph) and If i had gained that much coins in one day i would have remembered it!
So I'm far from convinced about the fact that the cards decide what you get. The usual amount is 5-80 coins for me and the amount is always dividable by 5.
On the OP topic
I think the Oracle is fine as it is but all rare cards should be won immediately instead of being limited to nymphs.
I sympathize with people getting annoyed by not getting the cards they get drawn for them by the oracle and have to look at the button and click it. The button itself is pointless really, you don't get to choose if you want the card from spins after beating the AI so why should there be a button or choice at all?