Miner's Guidewing 
Creature — Bird
$0.27 #11127 0.00 2.8 years
Flying, vigilance
When this creature dies, target creature you control explores. (Reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on that creature, then put the card back or put it into your graveyard.)
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Cards similar to Miner's Guidewing 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.
Citywatch Sphinx94%
$0.08↓#28848↓0.067.9 years↑
"When this creature dies, surveil 2."
Wreckage Wickerfolk87%
$0.21↓#14160↓0.15↑1.6 years↓
"Flying"
Nightveil Sprite85%
$0.11↓#7481↑0.057.9 years↑
"Flying"
Goblin Assault Team84%
$0.10↓#20900↓0.47↑7.3 years↑
"When this creature dies, put a +1/+1 counter on target creature you control."
Sparring Construct84%
$0.16↓#17659↓0.008.4 years↑
"When this creature dies, put a +1/+1 counter on target creature you control."
Guul Draz Mucklord84%
$0.06↓#25972↓0.57↑5.9 years↑
"When this creature dies, put a +1/+1 counter on target creature you control."
Spinal Centipede84%
$0.19↓#23688↓0.27↑7.9 years↑
"When this creature dies, put a +1/+1 counter on target creature you control."
Lawless Broker84%
$0.08↓#25672↓0.29↑9.9 years↑
"When this creature dies, put a +1/+1 counter on target creature you control."
Steadfast Sentry84%
$0.06↓#27536↓0.48↑7.2 years↑
"When this creature dies, put a +1/+1 counter on target creature you control."
Falcon, Winged Wonder82%
$0.17↓#25388↓0.000.2 years↓
"Flying"
Failed Conversion82%
$0.07↓#25834↓0.063.4 years
"When enchanted creature dies, surveil 2."
Enter the Unknown80%
$0.32↑#8477↑0.24↑8.6 years↑
"Target creature you control explores."
Wary Watchdog78%
$0.18↓#15781↓0.091.9 years
"When this creature enters or dies, surveil 1."
Lys Alana Informant78%
$0.15↓#15114↓0.000.6 years↓
"When this creature enters or dies, surveil 1."
Wary Thespian78%
$0.03↓#18590↓0.26↑3.4 years
"When this creature enters or dies, surveil 1."
Thawbringer78%
$0.09↓#21541↓0.011.1 years↓
"When this creature enters or dies, surveil 1."
Wild Hypothesis78%
$0.17↓#16301↓0.000.4 years↓
"Surveil 2."
Owlin Historian78%
$0.11↓#24059↓0.000.4 years↓
"Flying"
Abzan Skycaptain78%
$0.04↓#24095↓0.0011.6 years↑
"When this creature dies, bolster 2."
Hour of Defeat78%
$0.04↓#22098↓0.000.2 years↓
"Destroy target creature. Surveil 1."