If a Chernabog deck ever becomes too prevalent, you will see more decks running hard removal to easily deal with him, which will in turn reduce the amount of Chernabogs being run
With excellent stats across the board and an Evasive feature, however, it's no surprise that TCGPlayer puts her value at $208
One card that I vibed with upon first seeing it was Y'shtola, Night's BlessedY'shtola, Night's Blessed
The downside is that it potentially gives the opponent an extra card each turn, but the deck this card goes in is trying to win so fast that it wont matter how many cards the opponent has - they just wont be able to keep up on board
Standees featuring Tifa, Kefka, and Squall cards appeared at PAX East
Market trends can also play a significant role, so staying informed is crucial