Underworld Invasion

At the beginning of your upkeep, you may put
a Demon, Devil, or Imp card from your hand
onto the battlefield. If you don't, you may search
your library for a Demon, Devil, or Imp card,
reveal it, and put it into your hand. If you
search your library this way, shuffle it.
Demons, Devils, and Imps you control have
haste.