Altar of Shadows 
Artifact
$0.40 #21916 0.00 23.0 years
At the beginning of your first main phase, add 
for each charge counter on this artifact.
for each charge counter on this artifact., 
: Destroy target creature. Then put a charge counter on this artifact.Click a line or tag to filter
Cards similar to Altar of Shadows 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.
Black Market91%
$5.13↑#682↑0.52↑27.0 years↑
"At the beginning of your first main phase, add for each charge counter on this enchantment."
for each charge counter on this enchantment."
Gardenize88%
$1.07↑#14343↑0.40↑0.0 years↓
"At the beginning of your first main phase, add 
for each charge counter on this enchantment."
for each charge counter on this enchantment."
Ventifact Bottle86%
$1.12↑#29375↓0.0030.0 years↑
"At the beginning of your first main phase, if this artifact has a charge counter on it, tap it and remove all charge counters from it. Add 
for each charge counter removed this way."
for each charge counter removed this way."+1 more matching line
Weather Maker80%
$0.38↓#9005↑0.39↑0.6 years↓
", Remove two charge counters from this artifact: Add ."
, Remove two charge counters from this artifact: Add ."+1 more matching line
Plaguebearer80%
$29.15↑#243940.19↑28.3 years↑
"
: Destroy target nonblack creature with mana value X."
: Destroy target nonblack creature with mana value X."
Hunter of Eyeblights79%
$0.26↓#214030.15↑19.0 years↓
"
, : Destroy target creature with a counter on it."
, : Destroy target creature with a counter on it."
Rotating Fireplace79%
$0.32↓#8626↑0.10↑3.0 years↓
": Add an amount of equal to the number of time counters on this artifact."
: Add an amount of equal to the number of time counters on this artifact."
Vulshok Factory78%
$0.28↓#15953↑0.003.7 years↓
": Add 
. Put a charge counter on this artifact."
: Add . Put a charge counter on this artifact."
Deepfire Elemental78%
$0.07↓#28327↓0.59↑20.2 years↓
"
: Destroy target artifact or creature with mana value X."
: Destroy target artifact or creature with mana value X."
Everflowing Chalice76%
$0.28↓#252↑0.24↑16.7 years↓
": Add for each charge counter on this artifact."
: Add for each charge counter on this artifact."
Empowered Autogenerator76%
$0.23↓#3999↑0.10↑7.2 years↓
": Put a charge counter on this artifact. Add X mana of any one color, where X is the number of charge counters on this artifact."
: Put a charge counter on this artifact. Add X mana of any one color, where X is the number of charge counters on this artifact."
Coalition Relic76%
$0.38↓#3437↑0.0619.5 years↓
"At the beginning of your first main phase, remove all charge counters from this artifact. Add one mana of any color for each charge counter removed this way."
+1 more matching line
Bounty Hunter76%
$5.03↑#14358↑0.17↑29.0 years↑
": Destroy target creature with a bounty counter on it."
: Destroy target creature with a bounty counter on it."
The Eternity Elevator75%
$2.07↑#1558↑0.12↑1.2 years↓
": Add X mana of any one color, where X is the number of charge counters on this card."
: Add X mana of any one color, where X is the number of charge counters on this card."
Gorilla Shaman75%
$0.19↓#8234↑0.0630.4 years↑
": Destroy target noncreature artifact with mana value X."
: Destroy target noncreature artifact with mana value X."
Black Mana Battery74%
$0.70↑#261500.0632.4 years↑
", Remove any number of charge counters from this artifact: Add , then add an additional for each charge counter removed this way."
, Remove any number of charge counters from this artifact: Add , then add an additional for each charge counter removed this way."+1 more matching line
Hulking Raptor74%
$0.31↓#1934↑0.23↑2.9 years↓
"At the beginning of your first main phase, add ."
."
Suncrusher74%
$0.29↓#237880.21↑22.4 years
"
, , Remove a +1/+1 counter from this creature: Destroy target creature."
, , Remove a +1/+1 counter from this creature: Destroy target creature."
Glóin the Mighty // Easy Pickings74%
$0.24↓#7870↑0.17↑0.2 years↓
"At the beginning of your first main phase, add ."
."
Astral Cornucopia74%
$0.29↓#1315↑0.0612.7 years↓
": Choose a color. Add one mana of that color for each charge counter on this artifact."
: Choose a color. Add one mana of that color for each charge counter on this artifact."