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
Take the Promising Stairs, and while the other side helps you tutor for rooms, the right side can win you the game with just four split cards
Arcanis the Omnipotent Its not often that you tap a creature to draw three cards, and Arcanis the Omnipotent is also a wizard, a well-supported tribe
It may be straightforward, but hard to deny the power it brings to the table
Both of them do a good job of showing up the expansions new mechanics and key features, and after playing them I dont think a third one would have been necessary, especially because it would have just been another Ruby/Emerald like last time