Defender (This creature can't attack.), indestructible (Effects that say "destroy" don't destroy that permanent. An indestructible creature can't be destroyed by damage.)
: Monstrosity 10 (If this creature isn't monstrous, put ten +1/+1 counter(s) on it and it becomes monstrous.).
As long as Colossus of Akros is monstrous, it has trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.) and can attack as though it didn't have defender (This creature can't attack.).
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