Ana Sanctuary 
Enchantment
$0.21 #18585 0.21 25.4 years
At the beginning of your upkeep, if you control a blue or black permanent, target creature gets +1/+1 until end of turn. If you control a blue permanent and a black permanent, that creature gets +5/+5 until end of turn instead.
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Cards similar to Ana Sanctuary 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.
Dega Sanctuary76%
$0.24↑#27716↓0.1825.4 years
"At the beginning of your upkeep, if you control a black or red permanent, you gain 2 life. If you control a black permanent and a red permanent, you gain 4 life instead."
Gearsmith Guardian76%
$0.06↓#29413↓0.00↓8.3 years↓
"This creature gets +2/+0 as long as you control a blue creature."
Briarberry Cohort74%
$0.18↓#26287↓0.05↓18.5 years↓
"This creature gets +1/+1 as long as you control another blue creature."
Ashenmoor Cohort74%
$0.18↓#31684↓0.00↓18.5 years↓
"This creature gets +1/+1 as long as you control another black creature."
Dark Temper73%
$0.04↓#27673↓0.1917.7 years↓
"this card deals 2 damage to target creature. If you control a black permanent, destroy the creature instead."
Raka Sanctuary72%
$0.16↓#30674↓0.47↑25.4 years
"At the beginning of your upkeep, if you control a white or blue permanent, this enchantment deals 1 damage to target creature. If you control a white permanent and a blue permanent, this enchantment deals 3 damage instead."
Glen Elendra Liege71%
$0.93↑#5081↑0.00↓18.5 years↓
"Other black creatures you control get +1/+1."
God-Pharaoh's Faithful71%
$0.14↓#209730.10↓9.3 years↓
"Whenever you cast a blue, black, or red spell, you gain 1 life."
You're Not Alone70%
$0.18↓#12508↑0.07↓1.4 years↓
"Target creature gets +2/+2 until end of turn. If you control three or more creatures, it gets +4/+4 until end of turn instead."
Gravelgill Duo70%
$0.11↓#30048↓0.05↓18.5 years↓
"Whenever you cast a blue spell, this creature gets +1/+1 until end of turn."
Cavern Harpy70%
$0.26↑#167970.33↑25.7 years
"When this creature enters, return a blue or black creature you control to its owner's hand."