Neoform autocasts; it does not wait for confirmation.
It also does not appear to work with tokens. It cast and destroyed a zombie token in my last creature slot, but it did not fetch one of the two creatures in my deck.
Teammate said he was able to get Neoform to work with tokens, so maybe my scenario was an event-specific issue.
It was in ToA Black on the black node. I had Prized Amalgam and Diregraf Colossus in the deck. I sac’d a zombie token and Neoform didn’t fetch a creature. My hand was not full. I was having other issues on that event, too, like the Prized Amalgam trigger would only return 3 Amalgams even though I had 8 in my graveyard.
Anyway, that’s what I got for you/everyone.