Embalmer's Tools 
Artifact
$0.19 #13080 0.22 9.5 years
Activated abilities of creature cards in your graveyard cost 
less to activate.
less to activate.Tap an untapped Zombie you control: Target player mills a card.
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Cards similar to Embalmer's Tools 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.
Biomancer's Familiar86%
$1.90↑#3061↑0.38↑7.7 years↓
"Activated abilities of creatures you control cost less to activate. This effect can't reduce the mana in that cost to less than one mana."
less to activate. This effect can't reduce the mana in that cost to less than one mana."
Training Grounds86%
$5.08↑#1040↑0.53↑16.5 years↑
"Activated abilities of creatures you control cost less to activate. This effect can't reduce the mana in that cost to less than one mana."
less to activate. This effect can't reduce the mana in that cost to less than one mana."
Convergence of Dominion85%
$0.92↑#120370.12↓4.0 years↓
"As long as you control your commander, activated abilities of cards in your graveyard cost less to activate. This effect can't reduce the mana in that ability's activation cost to less than one mana."
less to activate. This effect can't reduce the mana in that ability's activation cost to less than one mana."
Heartstone85%
$1.89↑#3868↑0.12↓28.6 years↑
"Activated abilities of creatures cost less to activate. This effect can't reduce the mana in that cost to less than one mana."
less to activate. This effect can't reduce the mana in that cost to less than one mana."
Hair-Strung Koto79%
$0.59↑#22103↓0.3122.1 years↑
"Tap an untapped creature you control: Target player mills a card."
Zirda, the Dawnwaker76%
$1.50↑#3349↑0.37↑6.5 years↓
"Abilities you activate that aren't mana abilities cost less to activate. This effect can't reduce the mana in that cost to less than one mana."
less to activate. This effect can't reduce the mana in that cost to less than one mana."
Professor Hojo76%
$0.24↑#5026↑0.12↓1.4 years↓
"The first activated ability you activate during your turn that targets a creature you control costs less to activate."
less to activate."
Lich Lord of Unx75%
$5.59↑#124060.53↑17.5 years↑
"
: Target player loses X life and mills X cards, where X is the number of Zombies you control."
: Target player loses X life and mills X cards, where X is the number of Zombies you control."
Drowner of Secrets73%
$0.34↑#18684↓0.11↓19.0 years↑
"Tap an untapped Merfolk you control: Target player mills a card."
Mutagen Man, Living Ooze72%
$1.73↑#6041↑0.43↑0.6 years↓
"Activated abilities of artifact tokens you control cost less to activate."
less to activate."
Forensic Gadgeteer72%
$2.04↑#1406↑0.252.7 years↓
"Activated abilities of artifacts you control cost less to activate. This effect can't reduce the mana in that cost to less than one mana."
less to activate. This effect can't reduce the mana in that cost to less than one mana."
Fluctuator70%
$0.77↑#8422↑0.05↓28.0 years↑
"Cycling abilities you activate cost less to activate."
less to activate."