Spiketail Drakeling 
Creature — Drake
$0.18 #19657 0.13 19.9 years
Flying
Sacrifice this creature: Counter target spell unless its controller pays 
.
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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.
Spiketail Hatchling100%
$0.16↓#197830.28↑26.3 years↑
"Sacrifice this creature: Counter target spell unless its controller pays ."
."+1 more matching line
Spiketail Drake100%
$0.12↓#26460↓0.00↓26.3 years↑
"Sacrifice this creature: Counter target spell unless its controller pays 
."
."
Wizard Replica97%
$0.24↑#217520.50↑22.9 years↑
", Sacrifice this creature: Counter target spell unless its controller pays ."
, Sacrifice this creature: Counter target spell unless its controller pays ."+1 more matching line
Lilting Refrain92%
$0.29↑#223030.65↑27.9 years↑
"Sacrifice this enchantment: Counter target spell unless its controller pays 
, where X is the number of verse counters on this enchantment."
, where X is the number of verse counters on this enchantment."
Martyr of Frost92%
$0.21↑#214950.38↑21.0 years↑
", Reveal X blue cards from your hand, Sacrifice this creature: Counter target spell unless its controller pays ."
, Reveal X blue cards from your hand, Sacrifice this creature: Counter target spell unless its controller pays ."
Frontline Medic88%
$0.20↑#3503↑0.32↑13.6 years↓
"Sacrifice this creature: Counter target spell with in its mana cost unless its controller pays ."
in its mana cost unless its controller pays ."
Judge's Familiar88%
$0.23↑#5502↑0.45↑13.9 years↓
"Sacrifice this creature: Counter target instant or sorcery spell unless its controller pays ."
."
Cursecatcher88%
$0.44↑#11621↑0.67↑18.3 years↓
"Sacrifice this creature: Counter target instant or sorcery spell unless its controller pays ."
."
Daring Apprentice88%
$0.33↑#169170.75↑29.9 years↑
"
, Sacrifice this creature: Counter target spell."
, Sacrifice this creature: Counter target spell."
Cerulean Drake86%
$0.11↓#179580.33↑7.2 years↓
"Sacrifice this creature: Counter target spell that targets you."
Malevolent Hermit // Benevolent Geist85%
$1.19↑#4277↑0.35↑4.9 years↓
", Sacrifice this creature: Counter target noncreature spell unless its controller pays ."
, Sacrifice this creature: Counter target noncreature spell unless its controller pays ."
Quench84%
$0.20↑#13076↑0.187.6 years↓
"Counter target spell unless its controller pays ."
."
Diversion Unit84%
$0.31↑#7311↑0.131.6 years↓
", Sacrifice this creature: Counter target instant or sorcery spell unless its controller pays ."
, Sacrifice this creature: Counter target instant or sorcery spell unless its controller pays ."
Clash of Wills84%
$0.15↓#12548↑0.2211.1 years↓
"Counter target spell unless its controller pays ."
."
Mausoleum Wanderer80%
$0.28↑#6770↑0.32↑10.1 years↓
"Sacrifice this creature: Counter target instant or sorcery spell unless its controller pays , where X is this creature's power."
, where X is this creature's power."+1 more matching line
Phyrexian Debaser80%
$0.04↓#28872↓0.0527.6 years↑
"Flying"
Runeboggle80%
$0.04↓#26362↓0.1220.6 years
"Counter target spell unless its controller pays ."
."
It'll Quench Ya!78%
$0.27↑#3783↑0.00↓0.8 years↓
"Counter target spell unless its controller pays ."
."
Mindswipe78%
$0.36↑#14660↑0.29↑11.9 years↓
"Counter target spell unless its controller pays . this card deals X damage to that spell's controller."
. this card deals X damage to that spell's controller."
Soulsworn Jury78%
$0.26↑#216450.53↑21.0 years↑
", Sacrifice this creature: Counter target creature spell."
, Sacrifice this creature: Counter target creature spell."