Thassa's Intervention is a rare Instant card from Theros Beyond Death (THB), collector number 307. Current market price: $0.74 (foil $1.49), 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}.