Pack Guardian 
Creature — Wolf Spirit
$0.08 #20272 0.27 10.4 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.
Thundering Wurm88%
$1.71↑#30953↓0.42↑29.3 years↑
"When this creature enters, sacrifice it unless you discard a land card."
Fallow Wurm88%
$0.24↑#30392↓0.53↑29.2 years↑
"When this creature enters, sacrifice it unless you discard a land card."
Ayula's Influence83%
$0.81↑#9347↑0.247.2 years↓
"Discard a land card: Create a 2/2 green Bear creature token."
Nantuko Cultivator82%
$0.19↑#13762↑0.2524.6 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%
$0.31↑#182270.82↑3.9 years↓
"Flash"
Goblin Instigator80%
$0.24↑#3248↑0.238.1 years↓
"When this creature enters, create a 1/1 red Goblin creature token."
Invasion Reinforcements80%
$0.27↑#8336↑0.00↓0.8 years↓
"When this creature enters, create a 1/1 white Ally creature token."
+1 more matching line
Kyoshi Warriors80%
$0.15↑#12494↑0.00↓0.8 years↓
"When this creature enters, create a 1/1 white Ally creature token."
Prideful Parent80%
$0.12↑#10637↑0.09↓1.8 years↓
"When this creature enters, create a 1/1 white Cat creature token."
Watchful Giant80%
$0.02↓#29273↓0.00↓7.6 years↓
"When this creature enters, create a 1/1 white Human creature token."
Clarion Cathars80%
$0.06↓#229510.47↑4.9 years↓
"When this creature enters, create a 1/1 white Human creature token."
Ambassador Oak80%
$0.06↓#237710.53↑18.6 years↑
"When this creature enters, create a 1/1 green Elf Warrior creature token."
Elderleaf Mentor80%
$0.07↓#182760.00↓5.6 years↓
"When this creature enters, create a 1/1 green Elf Warrior creature token."
Resolute Reinforcements80%
$0.14↑#7094↑0.00↓4.0 years↓
"When this creature enters, create a 1/1 white Soldier creature token."
+1 more matching line
Attended Knight80%
$0.09↑#184530.60↑14.1 years↑
"When this creature enters, create a 1/1 white Soldier creature token."
Wakandan Shield Guard80%
$0.11↑#28483↓0.00↓0.2 years↓
"When this creature enters, create a 1/1 white Soldier creature token."
Yavimaya Sapherd80%
$0.26↑#170220.00↓8.4 years↓
"When this creature enters, create a 1/1 green Saproling creature token."
Daysquad Marshal79%
$0.14↑#236700.00↓6.4 years↓
"When this creature enters, create a 1/1 white Human Soldier creature token."
Protector of Gondor79%
$0.11↑#184240.38↑3.2 years↓
"When this creature enters, create a 1/1 white Human Soldier creature token."
Chimney Rabble79%
$0.14↑#170380.06↓3.6 years↓
"When this creature enters, create a 1/1 red Phyrexian Goblin creature token."