Sift Through Sands is a common Instant — Arcane card from Duel Decks: Mind vs. Might (DDS), collector number 9. Current market price: $0.35, TCGplayer market prices via Scryfall.
Draw two cards, then discard a card. If you've cast a spell named Peer Through Depths and a spell named Reach Through Mists this turn, you may search your library for a card named The Unspeakable, put it onto the battlefield, then shuffle.