From DominionStrategy Wiki
|Trash 3 cards from your hand. Each other player with 5 or more cards in hand trashes one of them.|
Maelstrom is an Event from Plunder. It is a trasher that also trashes cards from your opponents' hands—which may either help or hurt them.
 Official FAQ
- This isn't optional for the other players; they must trash a card if they have 5 or more cards in hand.
 Other rules clarifications
 English versions
|Trash 3 cards from your hand. Each other player with 5 or more cards in hand trashes one of them.||Plunder||December 2022|
 Other language versions
|German||Mahlstrom|| Entsorge 3 deiner Handkarten. Jeder Mitspieler
mit 5 oder mehr Handkarten entsorgt eine von ihnen.
Maelstrom is a trasher, and maybe helps the other players, maybe attacks them.
 Secret History
Based on the flavor. The first version was a double Masquerade - pass two cards, trash two cards. Then straight to the published card.