How is rush powercreep on getting a spare part? It's a lateral move if anything.
It's pseudo lateral. The rush is better than the spare part in most circumstances, but not all especially if you get the stealth or bounce part and can do something tricky with that. But you can play this on 3, immediately gain tempo, without the need of the extra mana to play the spare part. I wouldn't call this a complete power creep because the effects are not the same, but this one is better.