Tsabo's Decree 
Instant
$1.75 #23334 0.76 25.9 years
Choose a creature type. Target player reveals their hand and discards all creature cards of that type. Then destroy all creatures of that type that player controls. They can't be regenerated.
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Extinction78%
$0.89↓#209900.25↓28.9 years↑
"Destroy all creatures of the creature type of your choice."
Void76%
$0.18↓#234340.60↓25.9 years
"Choose a number. Destroy all artifacts and creatures with mana value equal to that number. Then target player reveals their hand and discards all nonland cards with mana value equal to the number."
Plague Wind72%
$2.50↑#6513↑0.46↓26.3 years
"Destroy all creatures you don't control. They can't be regenerated."
Harsh Mercy70%
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"Each player chooses a creature type. Destroy all creatures that aren't of a type chosen this way. They can't be regenerated."
Fertile Imagination70%
$0.36↓#204520.06↓21.0 years↓
"Choose a card type. Target opponent reveals their hand. Create two 1/1 green Saproling creature tokens for each card of the chosen type revealed this way."