Promise of Loyalty 
Sorcery
$0.25 #949 0.44 5.4 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%
$0.61↑#2038↓0.537.3 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↓#3301↓0.24↓9.8 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."