Gideon's Sacrifice is a common Instant card from War of the Spark (WAR), collector number 14. Current market price: $0.17 (foil $1.22), TCGplayer market prices via Scryfall.
Choose a creature or planeswalker you control. All damage that would be dealt this turn to you and permanents you control is dealt to the chosen permanent instead (if it's still on the battlefield).