Arboria {2}{G}{G}
World Enchantment
Creatures can't attack a player unless that player cast a spell or put a nontoken permanent onto the battlefield during their last turn.
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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.
Total War 84%
$2.49#19506
"Whenever a player attacks with one or more creatures, destroy all untapped non-Wall creatures that player controls that didn't attack, except for creatures the player hasn't controlled continuously since the beginning of the turn."
Bloodthirster 83%
$32.32#2531
"This creature can't attack a player it has already attacked this turn."
Web of Inertia 83%
$0.75#11836
"At the beginning of combat on each opponent's turn, that player may exile a card from their graveyard. If the player doesn't, creatures they control can't attack you this turn."
Collective Restraint 82%
$14.61#6738
"Creatures can't attack you unless their controller pays {X} for each creature they control that's attacking you, where X is the number of basic land types among lands you control."
Angelic Arbiter 82%
$4.93#5000
"Each opponent who cast a spell this turn can't attack with creatures."
Reclamation 81%
$0.62#27185
"Black creatures can't attack unless their controller sacrifices a land of their choice for each black creature they control that's attacking."
Ghostly Prison 81%
$4.56#161
"Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you."
Koskun Falls 81%
$15.68#10792
"Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you."
Windborn Muse 81%
$0.72#1011
"Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you."
Propaganda 81%
$2.03#115
"Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you."