Duskmourn: House of Horror - a strong pick if you like horror flavour, tense Limited games and a set that feels very different from normal fantasy Magic
Coming in packaged with a recursion ability and an inkable nature, anyone running Amber can easily have Lilo at four copies and still get mileage out of her at any stage of the game
Lands that can produce mana of any color have the familiar design tropes of these types of lands: the five colors of mana, if not a rainbow of color
Summons are also being added as Saga Creatures
Emerald Emerald Ink cards are good for flexible playstyle, every game is different and they can shift according to the situation, they will rely more on abilities and they seem to have more of an action and reaction type of playstyle over other ink types
But I think he's probably too expensive, even with his ability, to see consistent play