Rakdos, the Showstopper

Flying, trample
When Rakdos enters, flip a coin for each creature that isn't a Demon, Devil, or Imp. Destroy each creature whose coin comes up tails.

Ravnica: Clue Edition

Flying, trample
When Rakdos, the Showstopper enters the battlefield, flip a coin for each creature that isn't a Demon, Devil, or Imp. Destroy each creature whose coin comes up tails.

Ravnica Allegiance Promos

Ravnica Allegiance

All of the creatures whose coins come up tails are destroyed at the same time.

Players can't take any action between the time that coins are flipped and the time creatures are destroyed. For example, if they wish to cast a spell to have a creature gain indestructible, they must do so before Rakdos's triggered ability resolves, without knowing whether that creature's coin will come up heads or tails.