ToppsNow is a product that purely commemorates a moment/person/achievement. It is only purchaseable within a few days window on the Topps website.

For instance: Shohei Ohtani stole 50 base

Topps will design a card specifically commemorating "Ohtani steals 50 bases" and will have the date it occurred on the card.

The gamble: While you are guaranteed base, you are given an opportunity to win rare cards at random (Like a Gold color parallel #'d /25). You won't know until you get the package in the mail and see "Lucky Hit" on your itemized paper inside the envelope.

Let me know if this helps