Necrosynthesis 
Enchantment — Aura
$0.18 #9526 0.00 5.1 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%
$0.36↑#4961↑0.12↑14.0 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%
$1.48↑#12684↓0.17↑29.0 years↑
"Whenever a creature dies, put a +1/+1 counter on enchanted creature."
+1 more matching line
Rockslide Elemental78%
$0.17↓#24393↓0.18↑18.0 years↑
"Whenever another creature dies, you may put a +1/+1 counter on this creature."
Swarm of Bloodflies78%
$0.08↓#13969↓0.36↑12.1 years↑
"Whenever another creature dies, put a +1/+1 counter on this creature."
Gavony Unhallowed78%
$0.09↓#20015↓0.0810.2 years↑
"Whenever another creature you control dies, put a +1/+1 counter on this creature."
Rot Shambler78%
$0.18#13829↓0.30↑11.0 years↑
"Whenever another creature you control dies, put a +1/+1 counter on this creature."
Unruly Mob78%
$0.04↓#18200↓0.0015.1 years↑
"Whenever another creature you control dies, put a +1/+1 counter on this creature."
Vengeful Townsfolk78%
$0.13↓#20807↓0.002.5 years↓
"Whenever one or more other creatures you control die, put a +1/+1 counter on this creature."
Scavenger Drake77%
$0.15↓#22567↓0.0618.0 years↑
"Whenever another creature dies, you may put a +1/+1 counter on this creature."
Sengir Connoisseur77%
$0.18#20744↓0.004.1 years
"Whenever one or more other creatures die, put a +1/+1 counter on this creature. This ability triggers only once each turn."
Forced Adaptation76%
$0.14↓#84900.0013.7 years↑
"At the beginning of your upkeep, put a +1/+1 counter on enchanted creature."
Galuf's Final Act76%
$0.17↓#14816↓0.20↑1.4 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.""
Thanos, Death's Consort76%
$2.43↑#17338↓0.14↑0.3 years↓
"Whenever another creature dies, put a +1/+1 counter on this card."
Lumberknot76%
$0.12↓#15549↓0.0015.1 years↑
"Whenever a creature dies, put a +1/+1 counter on this creature."
Guardian Kirin76%
$0.06↓#24863↓0.055.3 years
"Whenever another creature you control dies, put a +1/+1 counter on this creature."
Algae Gharial76%
$0.11↓#22219↓0.19↑18.0 years↑
"Whenever another creature dies, you may put a +1/+1 counter on this creature."
Elenda, the Dusk Rose75%
$5.83↑#1280↑0.34↑8.8 years↑
"Whenever another creature dies, put a +1/+1 counter on this card."
+1 more matching line
Odric's Outrider75%
$0.23↑#20268↓0.065.1 years
"Whenever this creature or another creature you control dies, put a +1/+1 counter on target creature you control."
Elemental Mastery75%
$0.57↑#89130.16↑18.5 years↑
"Enchant creature"
Eternal Thirst74%
$0.14↓#5957↑0.0512.3 years↑
"Enchanted creature has lifelink and "Whenever a creature an opponent controls dies, put a +1/+1 counter on this creature.""
+1 more matching line