Stand Firm is a common Instant card from Duel Decks: Heroes vs. Monsters (DDL), collector number 21. Current market price: $0.04, TCGplayer market prices via Scryfall.
Target creature gets +1/+1 until end of turn. Scry 2. (Look at the top two cards of your library, then put any number of them on the bottom and the rest on top in any order.)