Backup Agent 
Creature — Human Citizen
$0.17 #21067 0.00 4.4 years
When this creature enters, put a +1/+1 counter on target creature.
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Cards similar to Backup Agent 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.
Bond Beetle100%
$0.12↓#16361↑0.28↑14.1 years↑
"When this creature enters, put a +1/+1 counter on target creature."
Ironpaw Aspirant100%
$0.15↓#15796↑0.002.8 years↓
"When this creature enters, put a +1/+1 counter on target creature."
Satyr Grovedancer100%
$0.09↓#214210.26↑12.3 years↑
"When this creature enters, put a +1/+1 counter on target creature."
Dauntless Survivor100%
$0.08↓#220270.39↑5.9 years↑
"When this creature enters, put a +1/+1 counter on target creature."
Timberland Guide100%
$0.04↓#212570.27↑14.3 years↑
"When this creature enters, put a +1/+1 counter on target creature."
Ironshell Beetle100%
$0.11↓#194880.27↑24.3 years↑
"When this creature enters, put a +1/+1 counter on target creature."
Jeong Jeong's Deserters100%
$0.14↓#14898↑0.000.8 years↓
"When this creature enters, put a +1/+1 counter on target creature."
Supply-Line Cranes98%
$0.05↓#29107↓0.0712.3 years↑
"When this creature enters, put a +1/+1 counter on target creature."
Kujar Seedsculptor98%
$0.07↓#216410.24↑9.9 years↑
"When this creature enters, put a +1/+1 counter on target creature you control."
Teyo's Lightshield98%
$0.08↓#27869↓0.18↑7.3 years↑
"When this creature enters, put a +1/+1 counter on target creature you control."
Virtuous Variant96%
$0.19↑#28929↓0.000.2 years↓
"When this creature enters, put a +1/+1 counter on target creature you control."
Keen-Eyed Raven96%
$0.17#213630.22↑2.2 years↓
"When this creature enters, put a +1/+1 counter on another target creature you control."
Iron Bully94%
$0.05↓#205310.17↑7.3 years↑
"When this creature enters, put a +1/+1 counter on target creature."
Sunshower Druid88%
$0.26↑#6745↑0.24↑2.1 years↓
"When this creature enters, put a +1/+1 counter on target creature and you gain 1 life."
Verdurous Gearhulk88%
$0.34↑#7827↑0.28↑9.9 years↑
"When this creature enters, distribute four +1/+1 counters among any number of target creatures you control."
Armament Corps88%
$0.07↓#28906↓0.0011.9 years↑
"When this creature enters, distribute two +1/+1 counters among one or two target creatures you control."
Wurmskin Forger88%
$0.13↓#29465↓0.0022.9 years↑
"When this creature enters, distribute three +1/+1 counters among one, two, or three target creatures."
Courage in Crisis88%
$0.18↑#8070↑0.007.3 years↑
"Put a +1/+1 counter on target creature, then proliferate."
Luminarch Aspirant86%
$0.36↑#3836↑0.16↑5.9 years↑
"At the beginning of combat on your turn, put a +1/+1 counter on target creature you control."
Loxodon Battle Priest86%
$0.17#185040.031.4 years↓
"At the beginning of combat on your turn, put a +1/+1 counter on another target creature you control."