Auril, the Frostmaiden

Snow landwalk, Indestructible
As long as you control less than seven snow permanents, Auril, the Frostmaiden isn't
a creature
Whenever a land enters the battlefield under an opponents control, that player must pay {1}, otherwise that land is a snow land in addition
to its other types. On your opponent's upkeep, if
they control a snow permanent, they lose 2 life.