Necrosynthesis 
Enchantment — Aura
$0.25 #9312 0.31 4.9 years
Enchant creature
Enchanted creature has "Whenever another creature dies, put a +1/+1 counter on this creature."
When enchanted creature dies, look at the top X cards of your library, where X is its power. Put one of those cards into your hand and the rest on the bottom of your library in a random order.
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Cards similar to Necrosynthesis 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.
Death's Presence82%
$0.35↑#4828↑0.12↓13.9 years↑
"Whenever a creature you control dies, put X +1/+1 counters on target creature you control, where X is the power of the creature that died."
Sadistic Glee82%
$1.87↑#12647↓0.18↓28.9 years↑
"Whenever a creature dies, put a +1/+1 counter on enchanted creature."
Lumberknot78%
$0.11↓#15284↓0.2514.9 years↑
"Whenever a creature dies, put a +1/+1 counter on this creature."
Algae Gharial78%
$0.13↓#21915↓0.05↓17.9 years↑
"Whenever another creature dies, you may put a +1/+1 counter on this creature."
Rockslide Elemental78%
$0.15↓#23966↓0.47↑17.9 years↑
"Whenever another creature dies, you may put a +1/+1 counter on this creature."
Swarm of Bloodflies78%
$0.09↓#13737↓0.50↑11.9 years↑
"Whenever another creature dies, put a +1/+1 counter on this creature."
Scavenger Drake77%
$0.18↓#22233↓0.4017.9 years↑
"Whenever another creature dies, you may put a +1/+1 counter on this creature."
Sengir Connoisseur77%
$0.21↓#20360↓0.00↓4.0 years
"Whenever one or more other creatures die, put a +1/+1 counter on this creature. This ability triggers only once each turn."
Rot Shambler77%
$0.17↓#13578↓0.00↓10.9 years↑
"Whenever another creature you control dies, put a +1/+1 counter on this creature."
Unruly Mob77%
$0.08↓#17858↓0.00↓14.9 years↑
"Whenever another creature you control dies, put a +1/+1 counter on this creature."
Gavony Unhallowed77%
$0.08↓#19717↓0.87↑10.1 years↑
"Whenever another creature you control dies, put a +1/+1 counter on this creature."
Vengeful Townsfolk77%
$0.12↓#20367↓0.332.4 years↓
"Whenever one or more other creatures you control die, put a +1/+1 counter on this creature."
Odric's Outrider77%
$0.22↓#19890↓0.00↓4.9 years
"Whenever this creature or another creature you control dies, put a +1/+1 counter on target creature you control."
Forced Adaptation76%
$0.17↓#83170.50↑13.6 years↑
"At the beginning of your upkeep, put a +1/+1 counter on enchanted creature."
+1 more matching line
Guardian Kirin76%
$0.11↓#24342↓0.50↑5.2 years
"Whenever another creature you control dies, put a +1/+1 counter on this creature."
Galuf's Final Act76%
$0.16↓#14818↓0.16↓1.2 years↓
"Until end of turn, target creature gets +1/+0 and gains "When this creature dies, put a number of +1/+1 counters equal to its power on up to one target creature.""
Chime of Night76%
$0.16↓#21153↓0.00↓27.2 years↑
"Enchant creature"
Thanos, Death's Consort76%
$2.20↑#18354↓0.00↓0.2 years↓
"Whenever another creature dies, put a +1/+1 counter on this card."
Elenda, the Dusk Rose75%
$5.36↑#1254↑0.288.6 years↑
"Whenever another creature dies, put a +1/+1 counter on this card."
+1 more matching line
Eternal Thirst74%
$0.21↓#5919↑0.2512.1 years↑
"Enchanted creature has lifelink and "Whenever a creature an opponent controls dies, put a +1/+1 counter on this creature.""