Spectral Gateguards is a common Creature — Spirit Soldier card from Avacyn Restored (AVR), collector number 37. Current market price: $0.11 (foil $0.24), TCGplayer market prices via Scryfall.
Soulbond (You may pair this creature with another unpaired creature when either enters. They remain paired for as long as you control both of them.) As long as this creature is paired with another creature, both creatures have vigilance.