サウナ
Sauna(cost:4) from Dominion Strategy Wiki
+1 Card
+1 Action
You may play an Avanto from your hand.
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While this is in play, when you play a Silver, you may trash a card from your hand.
Sauna is a promotional(Promo) Action card. It's a cantrip that allows you to trash(trasher) a card when you play a Silver. It is a split pile card, with five copies of Sauna sitting on top of five copies of Avanto.
ドミニオン Wiki