I purchased this product the very moment that I found out that it was available. (Disclaimer: I am on several boards and a mailing list from the author. While I am just a lurker I've been a long time fan of this system.) I wanted to wait to review the product until I had a chance to use it for a while.
Card based systems are a new thing for me, relatively speaking. I've been playing RPGs for decades though and even playing RPGs solitary for many years now. The Mythic:RPG system was my first successful foray into what I would consider free form solitary play. While I've used many oracles and some of my own design the Mythic:RPG system has been my goto for so long that it's like an old friend.
These cards are fantastic! They are a great adaption of the Mythic:RPG system into a card based structure. They also allow the system to run much faster and I find that this is one of the most important things for any RPG oracle. It needs to run the game, manage injecting randomness, but at the same time step into the background so that the game takes center stage. This is already something that I find Mythic:RPG to be great at, but using the cards just improves upon this quality to me.
An added tidbit of fun for me is that using the cards feels like a game unto itself. I don't dislike using tables, but they are sort of dry. Having cards that can be interacted with feels more fun and makes the whole thing more energetic to me. It also gives me a set line where the RPG system and its dice based mechanics are separate in my train of thought to the oracle.
All in all I highly recommend using these if you like Mythic:RPG, or solitary Oracle systems. If you are curious and want to try something like this out it would be great too. I hope that the author expands this to include other works, like the Location Crafter and the Creature Crafter.