Colossus Hammer is one of those cards Im always cautious to include into our Top 5
The Blue one-costs five for a flying 5/3 with impending for turns and three mana, that draws two and discards one, nice to fill that graveyard and dig
It has a ton of useful text, lets you ramp, and can even work as a decent Sultai commander
This means you could drop a land and a few Mox, then trade your hand in for a brand new one on your first turn, and leaving your opponent with a potentially bad hand.
If Neva leaves the battlefield while it has an Aura you control attached to it or at the same time as another creature with an Aura you control attached to it, its ability won't trigger for those enchantments unless they were destroyed by the same effect that caused Neva to leave the battlefield
Thats because this two-mana artifact is begging people to sign it, giving the card a page counter on it for each person thats done so