Boros Fury-Shield is a common Instant card from Ravnica: City of Guilds (RAV), collector number 5. Current market price: $0.16 (foil $0.87), TCGplayer market prices via Scryfall.
Prevent all combat damage that would be dealt by target attacking or blocking creature this turn. If {R} was spent to cast this spell, Boros Fury-Shield deals damage to that creature's controller equal to the creature's power.