Altar of the Wretched // Wretched Bonemass
Artifact // Creature — Skeleton Horror
When this artifact enters, you may sacrifice a nontoken creature. If you do, draw X cards, then mill X cards, where X is that creature's power.
Craft with one or more creatures {2}{B}{B}
{2}{B}: Return this card from your graveyard to your hand.
Wretched Bonemass's power and toughness are each equal to the total power of the exiled cards used to craft it.
This creature has flying as long as an exiled card used to craft it has flying. The same is true for first strike, double strike, deathtouch, haste, hexproof, indestructible, lifelink, menace, protection, reach, trample, and vigilance.
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Cards that do something similar 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.
Urborg Scavengers 98%
$0.30#12363
"This creature has flying as long as a card exiled with it has flying. The same is true for first strike, double strike, deathtouch, haste, hexproof, indestructible, lifelink, menace, reach, trample, and vigilance."
Soulflayer 93%
$0.34#20150
"If a creature card with flying was exiled with this creature's delve ability, this creature has flying. The same is true for first strike, double strike, deathtouch, haste, hexproof, indestructible, lifelink, reach, trample, and vigilance."
Death-Mask Duplicant 91%
$0.26#28357
"As long as a card exiled with this creature has flying, this creature has flying. The same is true for fear, first strike, double strike, haste, landwalk, protection, and trample."
Animus of Predation 91%
$0.08#31519
"If you removed a creature card with flying from the draft with cards named this card, this creature has flying. The same is true for first strike, double strike, deathtouch, haste, hexproof, indestructible, lifelink, menace, reach, and vigilance."
Eater of Virtue 91%
$0.38#9056
"As long as a card exiled with this card has flying, equipped creature has flying. The same is true for first strike, double strike, deathtouch, haste, hexproof, indestructible, lifelink, menace, protection, reach, trample, and vigilance."
Escaped Shapeshifter 91%
$1.09#29308
"As long as an opponent controls a creature with flying not named this card, this creature has flying. The same is true for first strike, trample, and protection from any color."
Rayami, First of the Fallen 88%
#21210
"As long as an exiled creature card with a blood counter on it has flying, this card has flying. The same is true for first strike, double strike, deathtouch, haste, hexproof, indestructible, lifelink, menace, protection, reach, trample, and vigilance."
Kuldotha Flamefiend 88%
$0.13#30463
"When this creature enters, you may sacrifice an artifact. If you do, this creature deals 4 damage divided as you choose among any number of targets."
Cairn Wanderer 87%
$0.35#11337
"As long as a creature card with flying is in a graveyard, this creature has flying. The same is true for fear, first strike, double strike, deathtouch, haste, landwalk, lifelink, protection, reach, trample, shroud, and vigilance."
Windwright Mage 87%
$0.16#27758
"This creature has flying as long as an artifact card is in your graveyard."
+1 more matching line
Project Deathlok Soldier 100%
$0.12#25440
"{2}{B}: Return this card from your graveyard to your hand."