frostclaw

vigilant 1
whenever this creature deals damage to another creature put a freeze counter on that creature.
each creature with a freeze counter on it gains
last strike (it deals combat damage after other creatures) whenever a freeze counter is put on a creature with 3 or more freeze counters on it tap
that creature that creature does not untap during
it's controllers next untap step this ability
remains in effect when this creature leaves the battlefield