Soulshriek 
Instant
$0.17 #25815 0.27 29.9 years
Target creature you control gets +X/+0 until end of turn, where X is the number of creature cards in your graveyard. Sacrifice that creature at the beginning of the next end step.
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Cards similar to Soulshriek 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.
Ghoul's Feast88%
$0.08↓#246390.07↓26.9 years↓
"Target creature gets +X/+0 until end of turn, where X is the number of creature cards in your graveyard."
Junkyo Bell82%
$0.27↑#227300.3621.9 years↓
"At the beginning of your upkeep, you may have target creature you control get +X/+X until end of turn, where X is the number of creatures you control. If you do, sacrifice that creature at the beginning of the next end step."
Hazoret's Favor78%
$0.15↓#224380.15↓9.4 years↓
"At the beginning of combat on your turn, you may have target creature you control get +2/+0 and gain haste until end of turn. If you do, sacrifice it at the beginning of the next end step."
Gnarlroot Pallbearer78%
$0.13↓#235060.47↑3.8 years↓
"When this creature enters, target creature gets +X/+X until end of turn, where X is the number of creature cards in your graveyard."
Puffer Extract78%
$0.20↑#290250.2526.9 years↓
"
, 
: Target creature you control gets +X/+X until end of turn. Destroy it at the beginning of the next end step."
, : Target creature you control gets +X/+X until end of turn. Destroy it at the beginning of the next end step."
Fatal Frenzy76%
$0.55↑#14320↑0.3619.6 years↓
"Until end of turn, target creature you control gains trample and gets +X/+0, where X is its power. Sacrifice it at the beginning of the next end step."
Celestial Sword74%
$0.52↑#31022↓0.1931.3 years↑
"
, : Target creature you control gets +3/+3 until end of turn. Its controller sacrifices it at the beginning of the next end step."
, : Target creature you control gets +3/+3 until end of turn. Its controller sacrifices it at the beginning of the next end step."
Mogg Cannon72%
$0.18↑#255970.12↓28.9 years↓
": Target creature you control gets +1/+0 and gains flying until end of turn. Destroy that creature at the beginning of the next end step."
: Target creature you control gets +1/+0 and gains flying until end of turn. Destroy that creature at the beginning of the next end step."
Phalanx Tactics70%
$0.06↓#218810.256.6 years↓
"Target creature you control gets +2/+1 until end of turn. Each other creature you control gets +1/+1 until end of turn."
Tears of Rage70%
$0.25↑#19369↑0.13↓22.6 years↓
"Attacking creatures you control get +X/+0 until end of turn, where X is the number of attacking creatures. Sacrifice those creatures at the beginning of the next end step."