The Great Wall

Defender
{1}: The Great Wall becomes a Wall Golem with base power and toughness 8/8.
{2}: If The Great Wall is a Golem, it gets reach
and "Prevent all damage that would be dealt to this creature".
{3}: Put a +1/+1 counter on The Great Wall.
For each +1/+1 counter on this card, it
can block an additional creature.