Screamer-Killer 
Creature — Tyranid
$0.58 #9885 0.65 4.0 years
Trample
Bio-Plasmic Scream — Whenever you cast a creature spell with mana value 5 or greater, this creature deals 5 damage to any target.
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Cards similar to Screamer-Killer 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.
Imminent Doom89%
$0.13↓#25326↓0.21↓9.3 years↑
"Whenever you cast a spell with mana value equal to the number of doom counters on this enchantment, this enchantment deals that much damage to any target. Then put a doom counter on this enchantment."
Zuri, Warrior of Wakanda84%
$0.20↓#16991↓0.16↓0.3 years↓
"Trample"
Embersmith83%
$0.13↓#29794↓0.06↓16.1 years↑
"Whenever you cast an artifact spell, you may pay 
. If you do, this creature deals 1 damage to any target."
. If you do, this creature deals 1 damage to any target."
Superior Foes of Spider-Man83%
$0.15↓#15200↓0.50↓1.1 years↓
"Trample"
Dreamstalker Manticore82%
$0.12↓#26946↓0.12↓6.7 years↑
"Whenever you cast your first spell during each opponent's turn, this creature deals 1 damage to any target."
Labyrinth Champion82%
$0.17↓#25256↓0.07↓13.1 years↑
"Whenever you cast a spell that targets this creature, this creature deals 2 damage to any target."
Pyromancer's Assault82%
$0.11↓#23107↓0.11↓10.7 years↑
"Whenever you cast your second spell each turn, this enchantment deals 2 damage to any target."
Burning Vengeance82%
$0.12↓#13147↓0.12↓15.1 years↑
"Whenever you cast a spell from your graveyard, this enchantment deals 2 damage to any target."
Pyroconvergence80%
$0.14↓#26681↓0.25↓14.0 years↑
"Whenever you cast a multicolored spell, this enchantment deals 2 damage to any target."
Pink Horror80%
$0.59↑#108010.18↓4.0 years
"Whenever you cast an instant or sorcery spell, this creature deals 2 damage to any target."
Wrathful Raptors80%
$7.22↑#2646↑0.45↓2.9 years↓
"Trample"
Aberrant80%
$5.06↑#5905↑0.53↓4.0 years
"Trample"
Enraged Flamecaster80%
$0.14↓#14469↓0.12↓0.7 years↓
"Whenever you cast a spell with mana value 4 or greater, this creature deals 2 damage to each opponent."
Kamahl, Pit Fighter80%
$0.20↓#18568↓0.13↓25.1 years↑
"
: this card deals 3 damage to any target."
: this card deals 3 damage to any target."
Knight Paladin80%
$4.34↑#5927↑0.25↓4.0 years
"Trample"
Cinder Hellion80%
$0.05↓#27438↓0.00↓10.7 years↑
"Trample"
Rumbling Aftershocks79%
$0.07↓#30896↓0.07↓16.7 years↑
"Whenever you cast a kicked spell, you may have this enchantment deal damage to any target equal to the number of times that spell was kicked."
Kalemne, Disciple of Iroas79%
$12.79↑#84860.07↓10.9 years↑
"Whenever you cast a creature spell with mana value 5 or greater, you get an experience counter."
Molten Nursery78%
$0.15↓#23441↓0.11↓11.0 years↑
"Whenever you cast a colorless spell, this enchantment deals 1 damage to any target."
Sarkhan's Unsealing78%
$1.03↑#6189↑0.53↓8.3 years↑
"Whenever you cast a creature spell with power 4, 5, or 6, this enchantment deals 4 damage to any target."