Pack Guardian 
Creature — Wolf Spirit
$0.08 #20282 0.24 10.5 years
Flash
When this creature enters, you may discard a land card. If you do, create a 2/2 green Wolf creature token.
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Cards similar to Pack Guardian 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.
Fallow Wurm88%
$0.25↑#30761↓0.00↓29.4 years↑
"When this creature enters, sacrifice it unless you discard a land card."
Thundering Wurm88%
$1.81↑#31257↓0.00↓29.5 years↑
"When this creature enters, sacrifice it unless you discard a land card."
Ayula's Influence83%
$0.98↑#9270↑0.05↓7.4 years↓
"Discard a land card: Create a 2/2 green Bear creature token."
Nantuko Cultivator82%
$0.18↑#14189↑0.00↓24.7 years↑
"When this creature enters, you may discard any number of land cards. Put that many +1/+1 counters on this creature and draw that many cards."
Lictor82%
$0.34↑#184780.204.0 years↓
"Flash"
Goblin Instigator80%
$0.29↑#3274↑0.08↓8.3 years↓
"When this creature enters, create a 1/1 red Goblin creature token."
Invasion Reinforcements80%
$0.16↑#8115↑0.09↓0.9 years↓
"When this creature enters, create a 1/1 white Ally creature token."
+1 more matching line
Kyoshi Warriors80%
$0.10↑#12356↑0.180.9 years↓
"When this creature enters, create a 1/1 white Ally creature token."
Prideful Parent80%
$0.22↑#10607↑0.06↓1.9 years↓
"When this creature enters, create a 1/1 white Cat creature token."
Watchful Giant80%
$0.05↓#29521↓0.00↓7.7 years↓
"When this creature enters, create a 1/1 white Human creature token."
Clarion Cathars80%
$0.12↑#233090.00↓5.1 years↓
"When this creature enters, create a 1/1 white Human creature token."
Ambassador Oak80%
$0.06↓#240100.00↓18.7 years↑
"When this creature enters, create a 1/1 green Elf Warrior creature token."
Elderleaf Mentor80%
$0.10↑#185860.06↓5.7 years↓
"When this creature enters, create a 1/1 green Elf Warrior creature token."
Resolute Reinforcements80%
$0.11↑#7153↑0.00↓4.1 years↓
"When this creature enters, create a 1/1 white Soldier creature token."
Attended Knight80%
$0.09↑#187880.00↓14.3 years↑
"When this creature enters, create a 1/1 white Soldier creature token."
Wakandan Shield Guard80%
$0.15↑#27682↓0.02↓0.3 years↓
"When this creature enters, create a 1/1 white Soldier creature token."
Yavimaya Sapherd80%
$0.23↑#172950.00↓8.5 years↓
"When this creature enters, create a 1/1 green Saproling creature token."
Protector of Gondor79%
$0.15↑#187780.07↓3.3 years↓
"When this creature enters, create a 1/1 white Human Soldier creature token."
Daysquad Marshal79%
$0.14↑#240060.00↓6.5 years↓
"When this creature enters, create a 1/1 white Human Soldier creature token."
Chimney Rabble79%
$0.13↑#173710.00↓3.7 years↓
"When this creature enters, create a 1/1 red Phyrexian Goblin creature token."