By paying X, tapping, and sacrificing Karns Sylex at sorcery speed, you can destroy each nonland permanent with mana value X or less
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It is right out there on the website
The above MTG cards are estimated to be the most valuable overall, but there are plenty of others worth at least a couple hundred dollarsenough to be worth covering, one way or another
Mono Red is the one exception that lacks these superior options, so Storm Herald is a great pickup in at least one deck: Valduk, Keeper of the Flame
Cards are sourced through a major European distributor and drop into the brands own secured storage the instant you reveal them