The aforementioned Starter Kit is a great way to onboard learning how to play the game, and you can keep it within the Final Fantasy theming if you and one other player use just that
When it was knocked out of development for rules issues, I kept the idea in my back pocket
Jenova essentially makes any sacrifice cards that you're running extra powerful thanks to her second ability
If one of your opponents has cast three or more spells in a single turn, you can pay zero mana for Mindbreak Trap
Our favourite is the six-ink Yzma, Scary Beyond All Reason, an adaptable way to mess with your opponents characters or help drive your own lore-making machine onwards when paired with the right amethyst cards from Rise of the Floodborn
(Whenever it attacks, for each opponent other than defending player, you may create a token copy that's tapped and attacking that player or a planeswalker they control