Soulshriek 
Instant
$0.08 #26177 0.07 30.0 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%
$0.10↑#249050.23↑27.0 years↓
"Target creature gets +X/+0 until end of turn, where X is the number of creature cards in your graveyard."
Junkyo Bell83%
$0.27↑#231400.18↑22.1 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%
$0.18↑#228920.119.5 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↑#239090.31↑3.9 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%
$0.18↑#292430.0027.0 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%
$0.58↑#14518↑0.22↑19.7 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%
$0.53↑#312560.0631.4 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."
Tears of Rage72%
$0.25↑#19458↑0.0022.7 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."
Mogg Cannon72%
$0.16↑#258570.0029.0 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↓#221720.006.7 years↓
"Target creature you control gets +2/+1 until end of turn. Each other creature you control gets +1/+1 until end of turn."