Thoughtbound Phantasm 
Creature — Spirit
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 that do something similar 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.
Scuttlegator 91%
$0.12#20712
"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 Sentinel 91%
$0.08#23875
"As long as this creature has a +1/+1 counter on it, it can attack as though it didn't have defender."
Faithbound Judge // Sinner's Judgment 87%
$0.78#11161
"As long as this creature has three or more judgment counters on it, it can attack as though it didn't have defender."
Spire Serpent 83%
#28872
"As long as you control three or more artifacts, this creature gets +2/+2 and can attack as though it didn't have defender."
+1 more matching line
Karsus Depthguard 80%
$0.05#22562
"As long as this creature's power is 5 or greater, it can attack as though it didn't have defender."
+1 more matching line
Demon Wall 80%
$0.23#16021
"As long as this creature has a counter on it, it can attack as though it didn't have defender."
+1 more matching line