Phelddagrif was good times, and was brought back again as the also surprisingly worthwhile Questing Phelddagrif
Ezio Auditore da Firenze The cards that say a player loses the game are show-stoppers
Hellkite Charger + Sword of Feast and Famine Cards Hellkite Charger, Sword of Feast and Famine Prerequisites You need Hellkite Charger on the battlefield and ready to attack, either equipped with Sword of Feast and Famine or enchanted with Bear Umbra
Pair Aurelia, the Warleader with Karlach, Fury of Avernus to get three combat steps in one turn, though not infinite combats
The plot is really important in Whispers in the Well, with lots of threads to follow through different cards
Collectors pay for the story behind the card as much as the card itself