Embolden is a common Instant card from Odyssey (ODY), collector number 22. Current market price: $0.20 (foil $3.52), TCGplayer market prices via Scryfall.
Prevent the next 4 damage that would be dealt this turn to any number of targets, divided as you choose. Flashback {1}{W} (You may cast this card from your graveyard for its flashback cost. Then exile it.)