Belbe, Corrupted Observer 

Legendary Creature — Phyrexian Zombie Elf
$0.35 #8160 0.75 5.8 years
At the beginning of each postcombat main phase, the active player adds 
for each of your opponents who lost life this turn. (Damage causes loss of life.)
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Cards similar to Belbe, Corrupted Observer 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.
Neheb, the Eternal84%
$7.59↑#1190↑0.49↓9.1 years↑
"At the beginning of each of your postcombat main phases, add
for each 1 life your opponents have lost this turn."
Magus of the Vineyard82%
$4.47↑#73610.54↓19.3 years↑
"At the beginning of each player's first main phase, that player adds 
."
Eladamri's Vineyard80%
$2.32↑#78560.35↓28.9 years↑
"At the beginning of each player's first main phase, that player adds 
."
Blinkmoth Urn80%
$1.02↑#5825↑0.47↓22.9 years↑
"At the beginning of each player's first main phase, if this artifact is untapped, that player adds
for each artifact they control."
Black Market74%
$4.98↑#674↑0.47↓26.9 years↑
"At the beginning of your first main phase, add
for each charge counter on this enchantment."
Famished Foragers74%
$0.11↓#20771↓0.18↓4.9 years
"When this creature enters, if an opponent lost life this turn, add 

."
Megatron, Tyrant // Megatron, Destructive Force73%
$2.09↑#11642↓0.58↓3.8 years↓
"At the beginning of each of your postcombat main phases, you may convert this card. If you do, add
for each 1 life your opponents have lost this turn."
Flamecache Gecko73%
$0.21↓#10685↓0.00↓2.1 years↓
"When this creature enters, if an opponent lost life this turn, add 
."
Cheering Crowd72%
$0.30↓#12996↓0.39↓1.0 years↓
"At the beginning of each player's first main phase, that player may put a +1/+1 counter on this creature. If they do, they add
for each counter on it."
Carpet of Flowers70%
$1.76↑#1262↑0.60↓27.9 years↑
"At the beginning of each of your main phases, if you haven't added mana with this ability this turn, you may add X mana of any one color, where X is the number of Islands target opponent controls."