Elite Scaleguard

Mana cost: {4}{W}
Type: Creature — Human Soldier
Power / toughness: 2 / 3
Set: Commander Masters #22 (uncommon)
Price: $0.24 USD

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.

Elite Scaleguard has 9 printings, first in Fate Reforged (2015). EDHREC ranks it #9,188 among Commander cards. It appears most in Hylda of the Icy Crown decks (1,462 on EDHREC). 6 public decks on TCG run it. It has 2 official rulings.

Legality

commander: legal
legacy: legal
vintage: legal
pauper: not legal
modern: legal
pioneer: legal
standard: not legal
brawl: not legal

Public decks that run Elite Scaleguard

Breed Lethality - Commander 2016, led by Atraxa, Praetors' Voice
Breed Lethality - Commander Anthology Volume II, led by Atraxa, Praetors' Voice
Call for Backup - March of the Machine Commander, led by Bright-Palm, Soul Awakener
Coven Counters - Midnight Hunt Commander, led by Leinore, Autumn Sovereign
Land's Wrath - Zendikar Rising Commander, led by Obuun, Mul Daya Ancestor
Silverquill Statement - Commander 2021, led by Breena, the Demagogue

Commanders that run Elite Scaleguard most

Deck counts from EDHREC.

Often played with Elite Scaleguard

Cards that show up in the same decks on EDHREC.

Rulings

2014-11-24: Bolster itself doesn't target any creature, though some spells and abilities that bolster may have other effects that target creatures. For example, you could put counters on a creature with protection from white with Abzan Skycaptain's bolster ability.
2014-11-24: You determine which creature to put counters on as the spell or ability that instructs you to bolster resolves.