Archaic Colossus

Archaic Colossus cannot be blocked except by three or more creatures.
When Archaic Colossus dies, exile it with three time counters on it. At the beginning of your upkeep remove a time counter. When the last is removed, return Archaic Colossus from exile to the battlefield transformed.
"A majestic and frightening beast. For something to have grown so large, it must have lived for millennia."