Promise of Loyalty 
Sorcery
$0.23 #931 0.58 5.5 years
Each player puts a vow counter on a creature they control and sacrifices the rest. Each of those creatures can't attack you or planeswalkers you control for as long as it has a vow counter on it.
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Cards similar to Promise of Loyalty 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.
Single Combat70%
$0.49↑#2068↓0.617.5 years↑
"Each player chooses a creature or planeswalker they control, then sacrifices the rest. Players can't cast creature or planeswalker spells until the end of your next turn."
Orzhov Advokist70%
$0.15↓#3353↓0.19↓9.9 years↑
"At the beginning of your upkeep, each player may put two +1/+1 counters on a creature they control. If a player does, creatures that player controls can't attack you or planeswalkers you control until your next turn."