You can cheat Salvation Colossus in with reanimation strategies, and the fact that this is an artifact creature means there are ways you can cheat this in with Master Transmuter or bring it back from the graveyard with Goblin Welder
You'll retain control of the Aura until the game ends, the Aura leaves the battlefield, or an effect causes someone else to gain control of the Aura
Shuffle up to four target cards with mana value 3 or greater from your graveyard into your library
in the past, and when we look back on those priceless childhood moments, it always feels like the cards were a little bigger than they are now
Devoted Druid I can accept this may be a little high for Devoted Druid, but this is one of the best elves around
Since there's no sideboard, you may want to consider maindecking some artifact or enchantment hate, especially if those are themes of the format