Cheapest priced copy (Throne of Eldraine): $0.35 at Card Kingdom, near mint, their price list as of .
Wintermoor Commander 
Creature — Human Knight · 2/* · Uncommon · March of the Machine Commander · #345
Deathtouch
Wintermoor Commander's toughness is equal to the number of Knights you control.
Whenever this creature attacks, another target Knight you control gains indestructible until end of turn. (Damage and effects that say "destroy" don't destroy it.)
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.35 to $0.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Throne of Eldraine | 205 | Uncommon | $0.35 | $0.79 |
| March of the Machine Commander | 345 | Uncommon | $0.35 | — |
3 rulings from Wizards of the Coast
- 4 October 2019As long as Wintermoor Commander is on the battlefield, its ability will count itself, so it'll be at least 2/1.
- 4 October 2019Because damage remains marked on a creature until the damage is removed as the turn ends, nonlethal damage dealt to Wintermoor Commander may become lethal if Knights you control leave the battlefield during that turn.
- 4 October 2019The ability that defines Wintermoor Commander's toughness works in all zones, not just the battlefield.