Mana Sculpt Instant Counter target spell
Mega Froslass is not good simply because of the instant damage itself, but because it forces you to limit your hand throughout the entire game, as any Snorunt on the bench could evolve and oneshot you with one energy attachment, and this way it limits counterplay to other attackers that synergise with the Snorunt line
Estinien Varlineau's first ability resolves before the spell that caused it to trigger
Slaughter does become a lot better when it can be recurred, especially in a format that offers as many threats as Commander
I think some of the other reprint versions of Kiki-Jiki, Mirror Breaker will eventually settle below $10, at which point everyone will feel the joy of copying whatever they think is coolest, from classics like Zealous Conscripts to new favorites like Terror of the Peaks
Nazahn, Revered Bladesmith I wish that Nazahn, Revered Bladesmith let you search your hand as well as your library