Elite Scaleguard is a uncommon Creature — Human Soldier card from The List (PLST), collector number CM2-27. Current market price: $0.08, TCGplayer market prices via Scryfall.
When this creature enters, bolster 2. (Choose a creature with the least toughness among creatures you control and put two +1/+1 counters on it.) Whenever a creature you control with a +1/+1 counter on it attacks, tap target creature defending player controls.