Nahiri's Machinations is a uncommon Enchantment card from Shadows over Innistrad (SOI), collector number 28. Current market price: $0.17 (foil $0.51), TCGplayer market prices via Scryfall.
At the beginning of combat on your turn, target creature you control gains indestructible until end of turn. {1}{R}: This enchantment deals 1 damage to target blocking creature.