Altar of Shadows 
Artifact
$0.41 #21643 0.06 22.9 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 Market90%
$4.98↑#674↑0.47↑26.9 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%
$1.39↑#29024↓0.22↑29.9 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%
$0.51↑#9971↑0.000.5 years↓
", Remove two charge counters from this artifact: Add ."
, Remove two charge counters from this artifact: Add ."+1 more matching line
Rotating Fireplace80%
$0.34↓#8455↑0.33↑2.9 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."
Plaguebearer80%
$36.39↑#240530.29↑28.2 years↑
"
: Destroy target nonblack creature with mana value X."
: Destroy target nonblack creature with mana value X."
Hunter of Eyeblights79%
$0.28↓#210770.0618.9 years↓
"
, : Destroy target creature with a counter on it."
, : Destroy target creature with a counter on it."
Vulshok Factory78%
$0.28↓#15654↑0.44↑3.6 years↓
": Add 
. Put a charge counter on this artifact."
: Add . Put a charge counter on this artifact."
Everflowing Chalice78%
$0.28↓#253↑0.1016.6 years↓
": Add for each charge counter on this artifact."
: Add for each charge counter on this artifact."
Deepfire Elemental78%
$0.09↓#27898↓0.22↑20.1 years↓
"
: Destroy target artifact or creature with mana value X."
: Destroy target artifact or creature with mana value X."
Empowered Autogenerator76%
$0.23↓#4060↑0.33↑7.0 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↓#3462↑0.23↑19.3 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%
$5.01↑#14197↑0.1528.9 years↑
": Destroy target creature with a bounty counter on it."
: Destroy target creature with a bounty counter on it."
The Eternity Elevator75%
$2.06↑#1687↑0.19↑1.1 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."
Hulking Raptor75%
$0.91↑#1950↑0.26↑2.8 years↓
"At the beginning of your first main phase, add 
."
."
Gorilla Shaman75%
$0.20↓#8130↑0.1030.2 years↑
": Destroy target noncreature artifact with mana value X."
: Destroy target noncreature artifact with mana value X."
Black Mana Battery74%
$0.71↑#258430.31↑32.3 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
Suncrusher74%
$0.32↓#235050.44↑22.3 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%
$0.29↓#10700↑0.000.1 years↓
"At the beginning of your first main phase, add ."
."
Astral Cornucopia74%
$0.24↓#1319↑0.53↑12.6 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."
Hedron Archive74%
$0.26↓#544↑0.0010.9 years↓
": Add ."
: Add ."