Greydwarf Brute

While Greydwarf Brute is a 1/1 you may sacrifice
a Greydwarf Eye and it becomes a 2/2.
While Greydwarf Brute is a 2/2 you may sacrifice
three Greydwarf Eyes and it becomes a 3/3 with
{t}:Prevent all damage to target creature.
While Greydwarf Brute is a 3/3 you may sacrifice
five Greydwarf Eyes and it becomes a 5/5 with
your choice of a Trample, Reach or Vigilance
counter.