Novablast Wurm 
Creature — Wurm
$1.99 #20115 0.35 16.7 years
Whenever this creature attacks, destroy all other creatures.
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Cards similar to Novablast Wurm expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Duneblast82%
$0.15↓#8184↑0.50↑12.1 years↓
"Choose up to one creature. Destroy the rest."
Sublime Exhalation80%
$0.28↓#15329↑0.12↓9.9 years↓
"Destroy all creatures."
Day of Judgment80%
$0.42↓#1909↑0.56↑17.0 years
"Destroy all creatures."
Swathcutter Giant79%
$0.17↓#214020.278.0 years↓
"Whenever this creature attacks, it deals 1 damage to each creature defending player controls."
Damning Verdict76%
$3.09↑#1130↑0.53↑4.5 years↓
"Destroy all creatures with no counters on them."
Season of the Witch75%
$26.11↑#206250.94↑32.2 years↑
"At the beginning of the end step, destroy all untapped creatures that didn't attack this turn, except for creatures that couldn't attack."
Forced March75%
$1.22↓#24481↓0.4327.0 years↑
"Destroy all creatures with mana value X or less."
Lord of Shatterskull Pass74%
$0.59↓#174490.12↓16.5 years
"Whenever this creature attacks, it deals 6 damage to each creature defending player controls."
Witch-king, Bringer of Ruin74%
$10.39↑#7426↑0.76↑3.3 years↓
"Whenever this card attacks, defending player sacrifices a creature with the least power among creatures they control."
Ritual of Soot74%
$0.24↓#168580.24↓8.0 years↓
"Destroy all creatures with mana value 3 or less."
Bontu's Last Reckoning74%
$0.51↓#12805↑0.319.3 years↓
"Destroy all creatures. Lands you control don't untap during your next untap step."
Grimgrin, Corpse-Born74%
$2.06↑#5878↑0.2815.1 years↓
"Whenever this card attacks, destroy target creature defending player controls, then put a +1/+1 counter on this card."
Supreme Verdict74%
$1.59↓#470↑0.86↑14.0 years↓
"Destroy all creatures."
Street Sweeper73%
$0.03↓#31407↓0.11↓14.0 years↓
"Whenever this creature attacks, destroy all Auras attached to target land."
Ronin Cliffrider72%
$0.36↓#224770.05↓21.7 years↑
"Whenever this creature attacks, you may have it deal 1 damage to each creature defending player controls."
Cleansing Nova72%
$0.21↓#1272↑0.57↑8.3 years↓
"• Destroy all creatures."
Scalding Salamander72%
$0.29↓#28421↓0.17↓28.3 years↑
"Whenever this creature attacks, you may have it deal 1 damage to each creature without flying defending player controls."
Ultima Weapon72%
$4.24↑#4743↑0.68↑1.4 years↓
"Whenever equipped creature attacks, destroy target creature an opponent controls."
Game Over72%
$0.30↓#8993↑0.390.6 years↓
"Destroy all creatures."
Mageta the Lion72%
$2.79↑#215190.63↑26.4 years↑
"
, 
, Discard two cards: Destroy all creatures except for Mageta. Those creatures can't be regenerated."
, , Discard two cards: Destroy all creatures except for Mageta. Those creatures can't be regenerated."