Single Combat 
Sorcery
$0.49 #2068 0.61 7.5 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.
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Cards similar to Single Combat 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.
Promise of Loyalty70%
$0.23↓#931↑0.585.5 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."
Silence70%
$4.58↑#399↑1.66↑17.3 years↑
"Your opponents can't cast spells this turn."