Cumulative upkeep (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.)
Snow permanents don't untap during their controllers' untap steps.
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.
Tornado84%
$0.80↑#278200.1930.2 years↑
"Cumulative upkeep "
removal-permanent, upkeep-cost, drawback
Volunteer Reserves80%
$0.19↓#294070.00↓29.2 years↑
"Cumulative upkeep "
upkeep-cost, drawback
Mist of Stagnation79%
$0.49↑#252531.41↑24.3 years↑
"Permanents don't untap during their controllers' untap steps."