Nettle Guard is a common Creature — Mouse Soldier card from Bloomburrow (BLB), collector number 23. Current market price: $0.20 (foil $0.28), TCGplayer market prices via Scryfall.
Valiant — Whenever this creature becomes the target of a spell or ability you control for the first time each turn, it gets +0/+2 until end of turn. {1}, Sacrifice this creature: Destroy target artifact or enchantment.