These are all strong abilities, and Nahri is a good starting point for the best Equipment commanders in MTG
Cards you choose not to cast this way (or can't cast this way) remain in exile
That's how broken paying life to draw cards is
Aetherworks Marvel defined its Standard format when it was used to put in play one of the best of the Eldrazi titans, Ulamog, the Ceaseless Hunger, ahead of time, effectively ending the game on the spot, but its a bit more of a roulette wheel in Commander
In particular, Nahiri builds very often include Forge Anew, and her affinity for equipment extends to the new Final Fantasy toys: A quarter of her recent decks now pack a Samurai's Katana or a Dancer's Chakrams
After a better dork comes along, you can bounce your dork and your aura