Novablast Wurm 
Creature — Wurm
$2.00 #19764 0.56 16.6 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%
$0.17↓#7974↑0.5311.9 years↓
"Choose up to one creature. Destroy the rest."
Day of Judgment80%
$0.63↓#1934↑0.4916.9 years
"Destroy all creatures."
Sublime Exhalation80%
$0.27↓#14978↑0.29↓9.8 years↓
"Destroy all creatures."
Swathcutter Giant79%
$0.18↓#211010.31↓7.9 years↓
"Whenever this creature attacks, it deals 1 damage to each creature defending player controls."
Damning Verdict76%
$3.94↑#1175↑0.534.4 years↓
"Destroy all creatures with no counters on them."
Season of the Witch75%
$24.35↑#204761.00↑32.1 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%
$0.97↓#24066↓0.29↓26.9 years↑
"Destroy all creatures with mana value X or less."
Lord of Shatterskull Pass74%
$0.60↓#171630.28↓16.4 years
"Whenever this creature attacks, it deals 6 damage to each creature defending player controls."
Witch-king, Bringer of Ruin74%
$11.62↑#7412↑0.31↓3.2 years↓
"Whenever this card attacks, defending player sacrifices a creature with the least power among creatures they control."
Ritual of Soot74%
$0.27↓#166380.36↓7.9 years↓
"Destroy all creatures with mana value 3 or less."
Bontu's Last Reckoning74%
$0.57↓#12601↑0.39↓9.1 years↓
"Destroy all creatures. Lands you control don't untap during your next untap step."
Grimgrin, Corpse-Born74%
$2.06↑#5872↑0.20↓14.9 years↓
"Whenever this card attacks, destroy target creature defending player controls, then put a +1/+1 counter on this card."
Supreme Verdict74%
$1.34↓#473↑0.70↑13.9 years↓
"Destroy all creatures."
Street Sweeper73%
$0.07↓#31119↓0.07↓13.9 years↓
"Whenever this creature attacks, destroy all Auras attached to target land."
Doomskar72%
$0.70↓#4788↑0.29↓5.6 years↓
"Destroy all creatures."
Ronin Cliffrider72%
$0.34↓#222000.00↓21.6 years↑
"Whenever this creature attacks, you may have it deal 1 damage to each creature defending player controls."
Cleansing Nova72%
$0.25↓#1268↑0.538.1 years↓
"• Destroy all creatures."
Scalding Salamander72%
$0.27↓#28057↓0.42↓28.2 years↑
"Whenever this creature attacks, you may have it deal 1 damage to each creature without flying defending player controls."
Ultima Weapon72%
$5.66↑#4986↑0.471.2 years↓
"Whenever equipped creature attacks, destroy target creature an opponent controls."
Path of Peril72%
$0.30↓#185820.20↓4.8 years↓
"Destroy all creatures [with mana value 2 or less]."