Guardian of New Benalia is a rare Creature — Human Soldier card from Dominaria United Promos (PDMU), collector number 19p. Current market price: $0.28 (foil $0.97), TCGplayer market prices via Scryfall.
Enlist (As this creature attacks, you may tap a nonattacking creature you control without summoning sickness. When you do, add its power to this creature's until end of turn.) Whenever this creature enlists a creature, scry 2. Discard a card: This creature gains indestructible until end of turn. Tap it.