Elite Scaleguard is a uncommon Creature — Human Soldier card from Commander 2016 (C16), collector number 65. Current market price: $0.25, 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.