Nihiloor 
Legendary Creature — Horror
£0.31 #16806 0.53 5.1 years
When Nihiloor enters, for each opponent, tap up to one untapped creature you control. When you do, gain control of target creature that player controls with power less than or equal to the tapped creature's power for as long as you control Nihiloor.
Whenever you attack with a creature an opponent owns, you gain 2 life and that player loses 2 life.
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Cards similar to Nihiloor 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 Vengeance81%
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"Whenever a creature you control attacks, defending player loses 1 life and you gain 1 life."
HYDRA Infiltration76%
£0.07↓#21563↓0.00↓0.2 years↓
"Whenever a creature you control attacks alone, target opponent loses 1 life and you gain 1 life."
Agate-Blade Assassin75%
£0.09↓#9117↑0.00↓2.1 years↓
"Whenever this creature attacks, defending player loses 1 life and you gain 1 life."
Brutal Hordechief74%
£1.67↑#6753↑0.10↓11.6 years↑
"Whenever a creature you control attacks, defending player loses 1 life and you gain 1 life."
Reaper's Talisman74%
£0.11↓#13147↑0.05↓5.1 years
"Whenever equipped creature attacks alone, defending player loses 2 life and you gain 2 life."
Tenured Inkcaster74%
£0.08↓#140020.00↓5.4 years
"Whenever a creature you control with a +1/+1 counter on it attacks, each opponent loses 1 life and you gain 1 life."
Mishra, Claimed by Gix73%
£4.09↑#6826↑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."
Sanguine Syphoner72%
£0.11↓#6540↑0.11↓1.8 years↓
"Whenever this creature attacks, each opponent loses 1 life and you gain 1 life."
Ragged Recluse // Odious Witch72%
£0.03↓#25738↓0.24↓4.8 years
"Whenever this creature attacks, defending player loses 1 life and you gain 1 life."
Karazikar, the Eye Tyrant71%
£8.45↑#3784↑0.485.1 years
"Whenever an opponent attacks another one of your opponents, you and the attacking player each draw a card and lose 1 life."
Spawnbroker70%
£0.31↓#20411↓0.80↑20.9 years↑
"When this creature enters, you may exchange control of target creature you control and target creature with power less than or equal to that creature's power an opponent controls."
Ancestor Dragon70%
£0.20↓#139930.568.2 years↑
"Whenever one or more creatures you control attack, you gain 1 life for each attacking creature."