-4 Thought Scour and +4 Ponder . It's a good delver set up. other than that, its pretty good

Unfortunately Ponder is not modern legal, but i would consider making it a casual deck for cards like that and Brainstorm , but probably not for the moment.

Telling Time

if your still looking for 2 drops, Invisible Stalker is really good. Augury Owl could also help your Delver of Secrets  ^Flip flip, and its a 2 drop. Merfolk Looter helps you cycle through your deck to look for what you want. Welkin Tern is more aggressive i suppose if you want to fly over quicker. Cosi's Trickster works really well with Void Stalker , and Ghost Quarter . Lighthouse Chronologist is pretty good too. i might drop the bears, and add in the trickster and the owls.

Void Mage only has 8 cards it can sac. Itself and unflipped Delver. seems week.

Have you seen the vial wizards deck?

Im playing it with the intention of sacrificing itself most of the time, and i have seen the vial wizards deck, not something im personally thrilled for.

i think Serum Visions would be much better than Sleight of Hand since you get to set up your next draw, securing your delver transformation

Serum visions are $7 a pop now or something ridiculous like that.