Throes of Chaos is a uncommon Sorcery card from Modern Horizons (MH1), collector number 150. Current market price: $0.24 (foil $2.07), TCGplayer market prices via Scryfall.
Cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order.) Retrace (You may cast this card from your graveyard by discarding a land card in addition to paying its other costs.)