Frostfang Barioth

Frostfang Barioth has flying as long as you
control 5 or more other snow permanents.
Whenever a snow land enters the battlefield
under your control, add {s}. This mana doesn't
empty from your mana pool as phases end.
When Frostfang Barioth attacks, draw a card. If
that card is a snow permanent, tap or untap
target permanent or scry 2. You may play an additional snow land this turn.