Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)

Haste (This creature can attack and as soon as it comes under your control.)

At the beginning of the end step, sacrifice this creature.

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)

Indestructible (Damage and effects that say "destroy" don't destroy this creature.)

If Darksteel Colossus would be put into a graveyard from anywhere, reveal Darksteel Colossus and shuffle it into its owner's library instead.

Flying

Vigilance (Attacking doesn't cause this creature to tap.)

Flying

Vigilance (Attacking doesn't cause this creature to tap.)

Attacking creatures get +2/+0 until end of turn.