Frigid Mountaineer

Mountainwalk (This creature can't be blocked as
long as defending player controls a Mountain.)
When Frigid Mountaineer enters the battlefield,
if you control four or more Mountains, create a
2/1 red Dwarf Berserker creature token. Then if
each Mountain you control is snow, Dwarves
you control gain haste until end of turn.
Those who prefer open spaces to cramped tunnels go
by way of the glacial overpass.