If you did the thing, you won
The artifact costs two, taps for two, and phases out your dork only, which will keep tokens alive too
Then, if that player did choose to copy the spell, the copy is put onto the stack
Fungsaur and Sengir Vampire are used solely as means to show the creature growing over time
Cast your permanent spell, upon entering you exile something and it effectively becomes "imprinted" onto your permanent, and your permanent's rules text tells you how the imprinted card impacts what the card does
She gave me a rundown via email of how it all came about: Allison Carl: Over the summer I was approached by one of the art directors from Wizards of the Coast to reinterpret the Qasali Slingers card for an upcoming, secret project