Sphere of Safety 

Enchantment
Creatures can't attack you or planeswalkers you control unless their controller pays {X} for each of those creatures, where X is the number of enchantments you control.
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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.
Baird, Steward of Argive 99%
$0.29#2538
"Creatures can't attack you or planeswalkers you control unless their controller pays {1} for each of those creatures."
Archon of Absolution 99%
$0.16#7601
"Creatures can't attack you or planeswalkers you control unless their controller pays {1} for each of those creatures."
Norn's Annex 97%
$5.54#1959
"Creatures can't attack you or planeswalkers you control unless their controller pays {W/P} for each of those creatures."
Sandwurm Convergence 91%
$0.35#2271
"Creatures with flying can't attack you or planeswalkers you control."
Onakke Oathkeeper 87%
$1.80#7157
"Creatures can't attack planeswalkers you control unless their controller pays {1} for each creature they control that's attacking a planeswalker you control."
Rite of the Raging Storm 81%
$1.20#3274
"Creatures named Lightning Rager can't attack you or planeswalkers you control."