Its breath doesn't assault the senses. It pollutes the mind.

Miasmic Mummy

When this creature enters, each player discards a card.

Amonkhet Remastered

When Miasmic Mummy enters the battlefield, each player discards a card.

Jumpstart

The List

Arena New Player Experience Extras

Amonkhet

When Miasmic Mummy’s triggered ability resolves, first the player whose turn it is chooses a card to discard, then each other player in turn order chooses a card to discard, then all of those cards are discarded simultaneously. No one sees what the other players are discarding before deciding which card to discard.