Since challenging also puts the same characters in harms way, Vineling Scars secondary ability of drawing a card every time your Floodborn character is banished on your opponents turn becomes a double-edged sword for your opponent
That leaves us with a relatively small pool of cards to choose best of from, which makes sense for cards that can only be played in such a skewed format
Shanna, Purifying Blade is kinda like Well of Lost Dreams if Well was time-gated and on a creature
It could simply be a Specter lord that also comes with an ability that pays you off for making your opponent discard, and I think wed all be pretty happy
Final Fantasy 6, 7, 10, 14 were chosen as the respective games, with Terra, Cloud, Tidus, and Y'shtola leading each deck respectively