Thassa's Intervention is a rare Instant card from Theros Beyond Death Promos (PTHB), collector number 72s. Current market price: — (foil $0.73), TCGplayer market prices via Scryfall.
Choose one — • Look at the top X cards of your library. Put up to two of them into your hand and the rest on the bottom of your library in a random order. • Counter target spell unless its controller pays twice {X}.