Prismatic Strands is a common Instant card from Commander 2019 (C19), collector number 69. Current market price: $7.50, TCGplayer market prices via Scryfall.
Prevent all damage that sources of the color of your choice would deal this turn. Flashback—Tap an untapped white creature you control. (You may cast this card from your graveyard for its flashback cost. Then exile it.)