Thoughtbound Phantasm 
Creature — Spirit
$0.24 #17280 0.40 7.9 years
Defender
Whenever you surveil, put a +1/+1 counter on this creature.
As long as this creature has three or more +1/+1 counters on it, it can attack as though it didn't have defender.
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Cards similar to Thoughtbound Phantasm 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.
Dimir Spybug96%
$0.21↓#13745↑0.06↓7.9 years
"Whenever you surveil, put a +1/+1 counter on this creature."
Scuttlegator94%
$0.11↓#20902↓0.00↓7.6 years
"As long as this creature has a +1/+1 counter on it, it can attack as though it didn't have defender."
+1 more matching line
Skyclave Sentinel92%
$0.11↓#24252↓0.28↓5.9 years↓
"As long as this creature has a +1/+1 counter on it, it can attack as though it didn't have defender."
+1 more matching line
Thraben Gargoyle // Stonewing Antagonizer88%
$0.12↓#21869↓0.3110.4 years↑
"Defender"
Mirko, Obsessive Theorist88%
$0.30↑#8014↑0.65↑2.6 years↓
"Whenever you surveil, put a +1/+1 counter on this card."
Demon Wall88%
$0.22↓#160340.23↓1.2 years↓
"As long as this creature has a counter on it, it can attack as though it didn't have defender."
+1 more matching line
Ludevic's Test Subject // Ludevic's Abomination88%
$0.25↑#186740.17↓14.9 years↑
"Defender"
Backstreet Bruiser86%
$0.04↓#26400↓0.21↓4.4 years↓
"As long as there are two or more counters among creatures you control, this creature can attack as though it didn't have defender."
+1 more matching line
Dark Maze86%
$0.12↓#30318↓0.00↓30.9 years↑
"Defender"
Skyclave Squid84%
$0.08↓#25537↓0.24↓5.9 years↓
"Defender"
Piston-Fist Cyclops84%
$0.07↓#28627↓0.00↓7.9 years
"Defender"
Nivix Cyclops83%
$0.08↓#22232↓0.62↑13.3 years↑
"Defender"
Steelclad Spirit83%
$0.11↓#29011↓0.474.8 years↓
"Defender"
Ogre Jailbreaker83%
$0.03↓#27684↓0.19↓13.9 years↑
"Defender"
Captive Weird // Compleated Conjurer82%
$0.17↓#26253↓0.07↓3.4 years↓
"Defender"
Prismari Pledgemage81%
$0.17↓#26608↓0.04↓5.4 years↓
"Defender"
Wishful Merfolk81%
$0.07↓#28683↓0.336.9 years
"Defender"
Ulvenwald Captive // Ulvenwald Abomination80%
$0.14↓#144120.00↓10.1 years↑
"Defender"
Shoal Serpent80%
$0.11↓#27787↓0.17↓16.9 years↑
"Defender"
Knight of Wundagore80%
$0.09↓#21078↓0.00↓0.2 years↓
"Whenever you put a +1/+1 counter on another creature, put a +1/+1 counter on this creature. This ability triggers only once each turn."