Cheapest priced copy (Commander 2016): $0.35 at Card Kingdom, near mint, their price list as of .
Elite Scaleguard 
Creature — Human Soldier · 2/3 · Uncommon · Midnight Hunt Commander · #85
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.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
9 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2016 | 65 | Uncommon | $0.35 | — |
| Commander 2021 | 91 | Uncommon | $0.35 | — |
| Commander Anthology Volume II | 27 | Uncommon | $0.35 | — |
| Commander Masters | 22 | Uncommon | $0.35 | $0.49 |
| Fate Reforged | 12 | Uncommon | $0.35 | $0.49 |
| Midnight Hunt Commander | 85 | Uncommon | $0.35 | — |
| March of the Machine Commander | 181 | Uncommon | $0.35 | — |
| The List | CM2-27 | Uncommon | $0.35 | — |
| Zendikar Rising Commander | 14 | Uncommon | $0.35 | — |
2 rulings from Wizards of the Coast
- 24 November 2014Bolster 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.
- 24 November 2014You determine which creature to put counters on as the spell or ability that instructs you to bolster resolves.