Colassen, The Stone Titan

Mountainwalk, Trample, Menace
Whenever a snow creature or a blue or black permanent enters the battlefield, you may put a +1/+1 counter on Colassen, The Stone Titan.
If a creature is blocked or blocks this creature, Colassen gains indestructible and deathtouch counters
If Colassen is blocked or blocks a creature with 6 or more power, that creature gets -1/-2 until end of turn.
If you see an avalanche, run if you see two endless black horns, it's too late