HYDRA Infiltration 
Enchantment
$0.13 #21973 0.00 0.2 years
When this enchantment enters, target opponent discards two cards.
Whenever a creature you control attacks alone, target opponent loses 1 life and you gain 1 life.
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Cards similar to HYDRA Infiltration 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.
Campaign of Vengeance94%
$0.25↑#12565↑0.32↑10.1 years↑
"Whenever a creature you control attacks, defending player loses 1 life and you gain 1 life."
Reaper's Talisman93%
$0.14↑#13124↑0.055.1 years↑
"Whenever equipped creature attacks alone, defending player loses 2 life and you gain 2 life."
Agate-Blade Assassin88%
$0.15↑#8985↑0.002.1 years↑
"Whenever this creature attacks, defending player loses 1 life and you gain 1 life."
Bob, Reluctant HYDRA Agent86%
$0.29↑#239180.000.2 years
"Whenever this card attacks alone, return him to his owner's hand. If you do, each opponent loses 2 life and you gain 2 life."
Ravenous Rats84%
$0.12↓#11730↑0.37↑28.2 years↑
"When this creature enters, target opponent discards a card."
Corrupt Court Official84%
$0.14↑#15922↑0.53↑27.3 years↑
"When this creature enters, target opponent discards a card."
Foul-Tongue Shriek84%
$0.25↑#10972↑0.63↑11.4 years↑
"Target opponent loses 1 life for each attacking creature you control. You gain that much life."
Tenured Inkcaster84%
$0.09↓#13962↑0.005.4 years↑
"Whenever a creature you control with a +1/+1 counter on it attacks, each opponent loses 1 life and you gain 1 life."
Brutal Nightstalker84%
$0.63↑#31525↓0.53↑28.2 years↑
"When this creature enters, you may have target opponent discard a card."
Sanguine Syphoner84%
$0.19↑#6561↑0.11↑1.8 years↑
"Whenever this creature attacks, each opponent loses 1 life and you gain 1 life."
Mishra, Claimed by Gix84%
$6.23↑#6812↑0.29↑3.8 years↑
"Whenever you attack, each opponent loses X life and you gain X life, where X is the number of attacking creatures. If this card and a creature named Phyrexian Dragon Engine are attacking, and you both own and control them, exile them, then meld them into this card, Lost to Phyrexia. It enters tapped and attacking."
Brutal Hordechief82%
$2.69↑#6725↑0.10↑11.6 years↑
"Whenever a creature you control attacks, defending player loses 1 life and you gain 1 life."
Ragged Recluse // Odious Witch82%
$0.03↓#257250.24↑4.8 years↑
"Whenever this creature attacks, defending player loses 1 life and you gain 1 life."
Abyssal Horror82%
$0.48↑#244600.73↑27.9 years↑
"When this creature enters, target player discards two cards."
Ebon Dragon82%
$8.13↑#27838↓0.47↑29.3 years↑
"When this creature enters, you may have target opponent discard a card."
Duskwielder81%
$0.28↑#210200.69↑5.6 years↑
"Boast — 
: Target opponent loses 1 life and you gain 1 life."
: Target opponent loses 1 life and you gain 1 life."
Black Panther, Claws of Bast81%
$2.06↑#222630.000.2 years
"Whenever a creature you control attacks alone, put a +1/+1 counter on it."
Fell Specter80%
$0.34↑#4878↑0.41↑8.1 years↑
"When this creature enters, target opponent discards a card."
Crowd of True Believers80%
$0.08↓#257150.000.2 years
"
: Target creature you control that's attacking alone gets +1/+0 until end of turn. You gain 1 life."
: Target creature you control that's attacking alone gets +1/+0 until end of turn. You gain 1 life."
Stony-Voiced Goblins80%
$0.26↑#200090.000.1 years
"When this creature enters, each opponent discards a card."