Haha, it's funny we have made the same basic choices.
Medusa alone isn't a very strong asset, but she and the mermaid make a great team, especially at the lower levels. (And you can make a real killer team by adding Water elemental to the mix.)

Maybe there would have been better choices, than the Earth Elemental, but I've been playing with level 4 and 6 decks for months and it's hard to get out of that state of mind. I only just noticed that he doesn't have the self-heal yet. Apparently, he only gets it at level 4...

The Highlander I bought because I had 2 cents left, lol, but the Wood Nymph's group heal ability can come in very useful.
And at the rate of 1 card a day, with all the different reward cards I figured it could take some time before I would have her in my deck. I'd rather have the group-heal sooner than later.

I actually sold the Ooze for exactly 0.122 Steem. I'm going to keep your advice in mind to wait till I have more and level them up before I sell them - but again... at the rate of 1 card a day, I'm not putting my hopes up. Also, it looks like the reward cards are getting cheaper every day, so I'm not sure about selling them for a higher price and wait until the cheaper ones are sold... reward cards are flooding the market. I don't really see their price go up a lot this season....

I still have everything to learn about selling cards in order to be able to buy them. I'm a hoarder, lol. I've always had enough Steem to just buy my cards and keep them all. I think I maybe sold 10 or 15 in all that time.

But for now at least I have a sort of decent deck - that starter pack was so frustrating - so I won't be in such a hurry to immediately sell every card I get.

I'm just as curious about my progress as you are :0)