Banishing Stroke is a uncommon Instant card from Avacyn Restored (AVR), collector number 7. Current market price: $0.16 (foil $0.46), TCGplayer market prices via Scryfall.
Put target artifact, creature, or enchantment on the bottom of its owner's library. Miracle {W} (You may cast this card for its miracle cost when you draw it if it's the first card you drew this turn.)