Mamoswine, Blizzard Rage

Mamoswine can block an additional creature each combat.
Mamoswine has +1/+1 for each two snow
creatures on the battlefield. Mamoswine has vigilance if it is a snow creature. Mamoswine is a
snow creature if your opponents control three or
more snow creatures.
When Mamoswine deals combat damage to a creature, that creature becomes snow in addition
to other types.
Trample