Frostlands Cradle

When Frostlands Cradle enters the battlefield,
choose a creature type.
Whenever a snow creature of the chosen type
enters the battlefield, each player gains 1 life.
Then, if Frostlands Cradle is tapped, untap it.
{t}: Add {c}. Frostlands Cradle doesn't untap
during your next untap step unless you tap an
untapped snow creature of the chosen type you control.