Q: If you draw a Creeper with Mystery Play (or any of its analogues) you play it and then redraw. What if you draw yet another Creeper?

A: You keep drawing until you get a non-Creeper.

You may be seeing this question because it relates to a deck with a Mystery Play analogue (a card with the same or nearly the same functionality, but a different name). To see all of the Mystery Play analogues, check out the Fluxx Card Comparison Chart, (also linked in the lower part of the right sidebar).