Form of the Dragon {4}{R}{R}{R}
Enchantment
At the beginning of your upkeep, this enchantment deals 5 damage to any target.
At the beginning of each end step, your life total becomes 5.
Creatures without flying can't attack you.
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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.
Lurking Green Dragon 84%
$0.21#22222
"This creature can't attack unless defending player controls a creature with flying."
Collective Restraint 83%
$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."
Akron Legionnaire 81%
#28174
"Except for creatures named this card and artifact creatures, creatures you control can't attack."
Court of Ire 81%
$0.38#3220
"At the beginning of your upkeep, this enchantment deals 2 damage to any target. If you're the monarch, it deals 7 damage instead."
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."
Sandwurm Convergence 80%
$0.35#2271
"Creatures with flying can't attack you or planeswalkers you control."
Web of Inertia 80%
$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."