Horned Stoneseeker 
Creature — Lizard
$0.12 #23063 0.00 3.8 years
Menace
When this creature enters, create a tapped Powerstone token. (It's an artifact with "
: Add 
. This mana can't be spent to cast a nonartifact spell.")
: Add . This mana can't be spent to cast a nonartifact spell.")When this creature leaves the battlefield, sacrifice a Powerstone.
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Cards similar to Horned Stoneseeker 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.
Argothian Opportunist92%
$0.06↓#252840.28↑3.8 years
"When this creature enters, create a tapped Powerstone token."
Stone Retrieval Unit92%
$0.11↓#186460.25↑3.8 years
"When this creature enters, create a tapped Powerstone token."
Koilos Roc92%
$0.05↓#256410.073.8 years
"When this creature enters, create a tapped Powerstone token."
Great Desert Prospector86%
$0.15↑#186100.11↑3.8 years
"When this creature enters, create a tapped Powerstone token for each other creature you control."
Junkyard Genius83%
$0.08↓#214900.063.8 years
"When this creature enters, create a tapped Powerstone token."
Powerstone Engineer80%
$0.18↑#258470.12↑3.8 years
"When this creature dies, create a tapped Powerstone token."
Gix's Caress78%
$0.08↓#219430.71↑3.8 years
"Create a tapped Powerstone token."
Thran Spider78%
$0.27↑#10422↑0.20↑3.8 years
"When this creature enters, you and target opponent each create a tapped Powerstone token."
Static Net78%
$0.15↑#203720.20↑3.8 years
"When this enchantment enters, you gain 2 life and create a tapped Powerstone token."
Wreck Hunter78%
$0.22↑#18211↑0.003.8 years
"When this creature enters, choose target player. You create a tapped Powerstone token for each nonland card in that player's graveyard that was put there from the battlefield this turn."
Arbalest Engineers76%
$0.16↑#231950.22↑3.8 years
"• Create a tapped Powerstone token."
Geology Enthusiast76%
$0.32↑#16316↑0.003.8 years
"At the beginning of your end step, create a tapped Powerstone token."
Fallaji Excavation76%
$0.08↓#256670.29↑3.8 years
"Create three tapped Powerstone tokens. You gain 3 life."
Urza's Command75%
$0.25↑#9587↑0.12↑3.8 years
"• Create a tapped Powerstone token."
Rivaz of the Claw74%
$0.58↑#2966↑0.29↑4.0 years
"Menace"
The Brothers' War74%
$1.13↑#12846↑0.60↑3.8 years
"Create two tapped Powerstone tokens."
Excavation Explosion74%
$0.11↓#201450.29↑3.8 years
"this card deals 3 damage to any target. Create a tapped Powerstone token."
Stern Lesson74%
$0.12#10623↑0.53↑3.8 years
"Draw two cards, then discard a card. Create a tapped Powerstone token."
Zoo Escapees74%
$0.11↓#234280.000.5 years↓
"When this creature leaves the battlefield, create a Mutagen token."
Sarinth Greatwurm72%
$0.30↑#14157↑0.26↑3.8 years
"Whenever a land enters, create a tapped Powerstone token."