Teferi's Moat 


Enchantment
As this enchantment enters, choose a color.
Creatures of the chosen color without flying can't attack you.
click a line to search just that ability, click more to combine them
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 83%
$0.21#22222
"This creature can't attack unless defending player controls a creature with flying."
Elephant Grass 81%
$3.73#10132
"Nonblack creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you."