Blizzard {G}{G}
Enchantment
Cast this spell only if you control a snow land.
Cumulative upkeep {2} (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)
Creatures with flying don't untap during their controllers' untap steps.
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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.
Energy Storm 100%
#27213
"Creatures with flying don't untap during their controllers' untap steps."
+1 more matching line
Dazzling Theater // Prop Room 83%
$0.78#1835
"Untap each creature you control during each other player's untap step."
An-Zerrin Ruins 81%
#21384
"Creatures of the chosen type don't untap during their controllers' untap steps."
Arctic Foxes 81%
$0.21#27066
"This creature can't be blocked by creatures with power 2 or greater as long as defending player controls a snow land."
Arena of the Ancients 81%
#18622
"Legendary creatures don't untap during their controllers' untap steps."
Finest Hour 80%
$1.17#8384
"Whenever a creature you control attacks alone, if it's the first combat phase of the turn, untap that creature. After this phase, there is an additional combat phase."
Tadeas, Juniper Ascendant 80%
$1.15#12242
"Whenever a creature you control with reach attacks, untap it and it can't be blocked by creatures with greater power this combat."