I have been an early adopter of Splinterlands back when it was called Steem Monsters. Game is still running on the steem block chain. Have spent a few hundred on cards. Hodl and selling testing the market.
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Pros
Cards have own unique numbers that you can lookup on blockchain
always new cards appearing
Sell,Trade,Earn Cards
Cons
tournament games take a while since 200+ players at times
Awesome review! Recently, Splinterlands implemented DEC payment for entering tourneys- usually, it is only 10 DEC for me, which is very low but since then the numbers have been cut in half in tournaments! Try and catch one this weekend!