Grim Guardian 

Enchantment Creature — Zombie
$0.33 #3403 0.18 12.5 years
Constellation — Whenever this creature or another enchantment you control enters, each opponent loses 1 life.
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Cards similar to Grim 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.
Balemurk Leech93%
$0.17↓#7991↓0.242.1 years↓
"Whenever an enchantment you control enters and whenever you fully unlock a Room, each opponent loses 1 life."
Northern Air Temple82%
$0.28↓#7511↓0.260.9 years↓
"Whenever another Shrine you control enters, each opponent loses 1 life and you gain 1 life."
Underworld Coinsmith82%
$0.26↓#9946↓0.07↓12.5 years
"Whenever this creature or another enchantment you control enters, you gain 1 life."
Thoughtrender Lamia80%
$0.33#11481↓0.50↑12.5 years
"Whenever this creature or another enchantment you control enters, each opponent discards a card."
Nexus Wardens80%
$0.21↓#17171↓0.116.7 years↓
"Whenever an enchantment you control enters, you gain 2 life."
Maggot Carrier80%
$0.17↓#22894↓0.1325.7 years↑
"When this creature enters, each player loses 1 life."
Setessan Skirmisher78%
$0.07↓#28473↓0.00↓6.7 years↓
"Whenever an enchantment you control enters, this creature gets +1/+1 until end of turn."
Blood-Toll Harpy78%
$0.03↓#28747↓0.07↓13.1 years
"When this creature enters, each player loses 1 life."
Rabid Bloodsucker78%
$0.09↓#27604↓0.00↓11.3 years↓
"When this creature enters, each player loses 2 life."
Howling Banshee78%
$0.07↓#25191↓0.05↓17.3 years↑
"When this creature enters, each player loses 3 life."
Blood Seeker76%
$0.22↓#2710↑0.2717.0 years↑
"Whenever a creature an opponent controls enters, you may have that player lose 1 life."
Doomwake Giant76%
$0.22↓#1896↑0.55↑12.5 years
"Whenever this creature or another enchantment you control enters, creatures your opponents control get -1/-1 until end of turn."
Oath of the Ancient Wood76%
$0.23↓#20112↓0.00↓13.3 years
"Whenever this enchantment or another enchantment you control enters, you may put a +1/+1 counter on target creature."
Oakheart Dryads76%
$0.09↓#24362↓0.00↓12.5 years
"Whenever this creature or another enchantment you control enters, target creature gets +1/+1 until end of turn."
Corpse Knight76%
$0.34↑#1436↑0.31↑7.3 years↓
"Whenever another creature you control enters, each opponent loses 1 life."
Wicked Visitor75%
$0.32↓#11466↓0.00↓3.1 years↓
"Whenever an enchantment you control is put into a graveyard from the battlefield, each opponent loses 1 life."
Rimefur Reindeer75%
$0.14↓#20182↓0.07↓3.1 years↓
"Whenever an enchantment you control enters, tap target creature an opponent controls."
Captivating Unicorn75%
$0.17↓#18292↓0.186.7 years↓
"Whenever an enchantment you control enters, tap target creature an opponent controls."
Thassa's Devourer74%
$0.07↓#22895↓0.28↑12.5 years
"Whenever this creature or another enchantment you control enters, target player mills two cards."