Starseer Mentor 
Creature — Bat Warlock
$0.23 #11271 0.17 2.2 years
Flying, vigilance
At the beginning of your end step, if you gained or lost life this turn, target opponent loses 3 life unless they sacrifice a nonland permanent of their choice or discard a card.
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Cards similar to Starseer Mentor 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.
Perforating Artist87%
$0.26↑#6510↑0.53↑1.9 years
"At the beginning of your end step, if you attacked this turn, each opponent loses 3 life unless that player sacrifices a nonland permanent of their choice or discards a card."
Wax-Wane Witness86%
$0.14↓#13926↓0.00↓2.2 years
"Flying, vigilance"
Torment of Scarabs84%
$0.28↑#8739↑0.47↑9.3 years↑
"At the beginning of enchanted player's upkeep, that player loses 3 life unless they sacrifice a nonland permanent of their choice or discard a card."
Torment of Hailfire84%
$34.03↑#625↑1.61↑9.3 years↑
"Repeat the following process X times. Each opponent loses 3 life unless that player sacrifices a nonland permanent of their choice or discards a card."
Thornplate Intimidator82%
$0.10↓#116650.112.2 years
"When this creature enters, target opponent loses 3 life unless they sacrifice a nonland permanent of their choice or discard a card."
Nicol Bolas, the Deceiver82%
$10.96↑#127800.88↑9.3 years↑
"+3: Each opponent loses 3 life unless that player sacrifices a nonland permanent of their choice or discards a card."
Torment of Venom81%
$0.16↓#18687↓0.229.3 years↑
"Put three -1/-1 counters on target creature. Its controller loses 3 life unless they sacrifice another nonland permanent of their choice or discard a card."
Tergrid, God of Fright // Tergrid's Lantern80%
$17.89↑#1589↑2.81↑5.7 years↑
"
: Target player loses 3 life unless they sacrifice a nonland permanent of their choice or discard a card."
: Target player loses 3 life unless they sacrifice a nonland permanent of their choice or discard a card."
Krond the Dawn-Clad76%
$0.73↑#21855↓0.1114.4 years↑
"Flying, vigilance"
Remorseless Punishment75%
$0.14↓#22537↓0.1410.7 years↑
"Target opponent loses 5 life unless that player discards two cards or sacrifices a creature or planeswalker of their choice. Repeat this process once."
Rottenmouth Viper74%
$8.20↑#3050↑0.62↑2.2 years
"Whenever this creature enters or attacks, put a blight counter on it. Then for each blight counter on it, each opponent loses 4 life unless that player sacrifices a nonland permanent of their choice or discards a card."
Forbidden Ritual74%
$1.09↑#25324↓0.75↑29.7 years↑
"Sacrifice a nontoken permanent. If you do, target opponent loses 2 life unless that player sacrifices a permanent of their choice or discards a card. You may repeat this process any number of times."
Cataclysmic Gearhulk74%
$0.30↑#5337↑0.88↑10.1 years↑
"Vigilance"
Lunar Convocation73%
$0.64↑#3213↑0.122.2 years
"At the beginning of your end step, if you gained life this turn, each opponent loses 1 life."
Rakdos, Patron of Chaos73%
$4.66↑#2765↑0.34↑2.7 years
"At the beginning of your end step, target opponent may sacrifice two nonland, nontoken permanents of their choice. If they don't, you draw two cards."
Braids's Frightful Return72%
$0.20↓#119210.194.1 years↑
"Target opponent may sacrifice a nonland, nontoken permanent of their choice. If they don't, they lose 2 life and you draw a card."
Old-Growth Educator72%
$0.13↓#23599↓0.130.5 years↓
"Reach, vigilance"
Ulamog's Dreadsire71%
$4.20↑#3477↑0.59↑2.3 years
"Vigilance"
Zoyowa Lava-Tongue70%
$0.21↓#7839↑0.112.9 years
"At the beginning of your end step, if you descended this turn, each opponent may discard a card or sacrifice a permanent of their choice. Zoyowa deals 3 damage to each opponent who didn't."
Foolish Fate70%
$0.17↓#15765↓0.120.5 years↓
"If you gained life this turn, that creature's controller loses 3 life."