Galio, the Colossus

Defender, Flying, Trample, Vigilance
Whenever an opponent casts an enchantment, instant, or sorcery spell, put an awakening
counter on Galio, the Colossus.
As long as Galio, the Colossus has four or more awakening counters on it, it can attack as though
it did not have defender.
Whenever Galio, the Colossus attacks, remove an awakening counter from it.