Guardian Scalelord 

Creature — Dragon
$0.31 #4699 0.11 3.5 years
Backup 1 (When this creature enters, put a +1/+1 counter on target creature. If that's another creature, it gains the following abilities until end of turn.)
Flying
Whenever this creature attacks, return target nonland permanent card with mana value X or less from your graveyard to the battlefield, where X is this creature's power.
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Cards similar to Guardian Scalelord 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.
Winter Soldier, Reborn Avenger80%
$0.31#12323↓0.23↑0.3 years↓
"Whenever this card attacks, return target creature card with mana value less than or equal to this card's power from your graveyard to the battlefield. If a Hero enters this way, it enters with an additional +1/+1 counter on it."
Archangel Elspeth76%
$4.62↑#54710.28↑3.5 years
"−6: Return all nonland permanent cards with mana value 3 or less from your graveyard to the battlefield."
Carmen, Cruel Skymarcher76%
$0.67↑#2875↑0.38↑2.9 years
"Whenever this card attacks, return up to one target permanent card with mana value less than or equal to this card's power from your graveyard to the battlefield."
Bishop of Rebirth76%
$0.42↑#11686↓0.199.1 years↑
"Whenever this creature attacks, you may return target creature card with mana value 3 or less from your graveyard to the battlefield."
Syr Faren, the Hengehammer76%
$0.25↓#16530↓0.00↓7.0 years↑
"Whenever this card attacks, another target attacking creature gets +X/+X until end of turn, where X is this card's power."
Alesha, Who Laughs at Fate75%
$1.85↑#1674↑0.34↑1.9 years↓
"At the beginning of your end step, if you attacked this turn, return target creature card with mana value less than or equal to this card's power from your graveyard to the battlefield."