It takes a lot of mana to make the removal side work, but if you manage to get delirium, it doesnt really matter as it doubles the damage of your burn spells, as well as pingers like Thermo-Alchemist
Debtors' Knell There is a ton of synergy that you can run in order to get the best value out of the Debtors' Knell and the ongoing sweet card advantage it brings to the battlefield
It allows players to get three mana of any color when they sac it and is crucial to a first turn Channel-Fireball kill in a Red/Green deck
Some of the higher priced cards are those with fewer prints, or have become valuable just because of the way they can devastate a table
Lifecrafters Bestiary is even good in multiples, as its not legendary and you can just have multiple scry triggers to start every turn
All-Out Assault All-Out Assault is a novel way to grant extra attack steps, buffing your board for the next couple swings that turn