I think the current prestige mechanic is kind of a problem, because it effectively boots you back to the tutorial before most of your cards are at all interesting. The second card type is cool but held back by a subtle cost: adding cards doesn't increase draw rate, so the already-good cards and combos are less likely to show up. Leviathan is sort of a compensation for this, but it's overpriced and the transient rune to make its mechanic work is more efficiently placed on a Herd elk.
Wanderer is a little boring for how powerful it is. Surely it could get an upgrade to do something weirder, like giving you another energy if you have zero energy when it triggers. That'd be a luck-pushing incentive.