standard
future
historic
gladiator
pioneer
explorer
modern
legacy
pauper
vintage
penny
commander
brawl
alchemy
paupercommander
duel
oldschool
premodern
Rulings
Kiora's threshold ability checks your graveyard at the moment it would trigger to see if you have seven or more cards in your graveyard. If you don't, the ability won't trigger at all. If it does trigger, the ability will check again as it tries to resolve. If you don't have seven or more cards in your graveyard at that time, the ability won't resolve and none of its effects will happen.
Rulings
Kiora's threshold ability checks your graveyard at the moment it would trigger to see if you have seven or more cards in your graveyard. If you don't, the ability won't trigger at all. If it does trigger, the ability will check again as it tries to resolve. If you don't have seven or more cards in your graveyard at that time, the ability won't resolve and none of its effects will happen.
Your collection? Your decks?
Want to manage your collection and/or create decks?