Grim Guardian 
Enchantment Creature — Zombie
$0.36 #3238 0.22 12.3 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↓#7620↓0.12↓1.9 years↓
"Whenever an enchantment you control enters and whenever you fully unlock a Room, each opponent loses 1 life."
Northern Air Temple82%
$0.28↓#7730↓0.00↓0.8 years↓
"Whenever another Shrine you control enters, each opponent loses 1 life and you gain 1 life."
Underworld Coinsmith82%
$0.29↓#9478↓0.08↓12.3 years
"Whenever this creature or another enchantment you control enters, you gain 1 life."
Thoughtrender Lamia80%
$0.35↓#10915↓0.65↑12.3 years
"Whenever this creature or another enchantment you control enters, each opponent discards a card."
Nexus Wardens80%
$0.19↓#16902↓0.47↑6.6 years↓
"Whenever an enchantment you control enters, you gain 2 life."
Maggot Carrier80%
$0.15↓#22542↓0.2425.6 years↑
"When this creature enters, each player loses 1 life."
Setessan Skirmisher78%
$0.08↓#28021↓0.00↓6.6 years↓
"Whenever an enchantment you control enters, this creature gets +1/+1 until end of turn."
Blood-Toll Harpy78%
$0.03↓#28363↓0.33↑12.9 years
"When this creature enters, each player loses 1 life."
Rabid Bloodsucker78%
$0.08↓#27217↓0.2111.1 years↓
"When this creature enters, each player loses 2 life."
Howling Banshee78%
$0.05↓#24930↓0.2417.1 years↑
"When this creature enters, each player loses 3 life."
Blood Seeker76%
$0.20↓#25950.2716.9 years↑
"Whenever a creature an opponent controls enters, you may have that player lose 1 life."
Doomwake Giant76%
$0.22↓#1790↑0.47↑12.4 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↓#19682↓0.07↓13.1 years
"Whenever this enchantment or another enchantment you control enters, you may put a +1/+1 counter on target creature."
Humbler of Mortals76%
$0.16↓#19357↓0.2912.3 years
"Whenever this creature or another enchantment you control enters, creatures you control gain trample until end of turn."
Oakheart Dryads76%
$0.09↓#23958↓0.2012.3 years
"Whenever this creature or another enchantment you control enters, target creature gets +1/+1 until end of turn."
Corpse Knight76%
$0.40↑#1423↑0.287.2 years↓
"Whenever another creature you control enters, each opponent loses 1 life."
Wicked Visitor75%
$0.26↓#11071↓0.00↓3.0 years↓
"Whenever an enchantment you control is put into a graveyard from the battlefield, each opponent loses 1 life."
Rimefur Reindeer75%
$0.14↓#19722↓0.80↑3.0 years↓
"Whenever an enchantment you control enters, tap target creature an opponent controls."
Captivating Unicorn75%
$0.17↓#18110↓0.256.6 years↓
"Whenever an enchantment you control enters, tap target creature an opponent controls."
Thassa's Devourer74%
$0.07↓#22476↓0.1412.3 years
"Whenever this creature or another enchantment you control enters, target player mills two cards."