mtg rarity card should not determine the power level, and we will never end up with mythic rares being simply the most powerful cards in the set" MTG card rarity explained -

It can be a really good combat trick that nobody expects, it gets you a token (hint you can hit the attacker as its declared and block with the token this makes!) and it really cheap to cast

Some people might call Darksteel Colossus the original Eldrazi

I had somewhat just assumed this year was going to be a weak one, due to Onslaught mostly, but also forgetting how good cycling and flashback are

You are better off either ramping and surviving to six mana without synergy and just winning with your six drops if you want to play them

The defender ability was added to them later in their Oracle text

with the Quarter Century Bonanza