Trading card games (and card games in general) have always been my jam, but I have fond memories of long card rides spent playing Pokmon Trading Card Game and trying to build the perfect deck
Another possible one-drop to consider is Inventors Apprentice, though we will have to make some tweaks to really utilize it
When you win the flip, copy that spell
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The other was a 6-person event where I played against Mono Red, a unique Esper Control, and UW Auras
You may be worried about losing such a monster, and while it doesn't have the same recurring effect that "Archlord Kristya" does, it does have access to other support, like "Wall of Thorns", "Tytannial, Princess of Camellias", and "Black Garden"