The Spectacle cost of this card is similar to the Modern staple card, Bedlam Reveler. That card has done a lot of damage in the Modern format, which may signal that Rix Maadi Reveler will have a similar impact on Standard.
For the best effect, one needs to play Rix Maadi with no other cards in hand — or at least with an extra land. It's a perfect looter for aggressive Rakdos and Mardu lists.
But of course, it can be just as effective in Mono Red lists that need to cycle through a bunch of lands in order to find the right answer at the right time.