Cheapest priced copy (Commander 2020): $3.99 at Card Kingdom, near mint, their price list as of .
Silvar, Devourer of the Free 
Legendary Creature — Cat Nightmare · 4/2 · Mythic · Commander 2020 · #15
Partner with Trynn, Champion of Freedom (When this creature enters, target player may put Trynn into their hand from their library, then shuffle.)
Menace
Sacrifice a Human: Put a +1/+1 counter on Silvar. It gains indestructible until end of turn.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $0.99 to $3.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2020 | 15 | Mythic | $3.99 | $0.99 |
One ruling from Wizards of the Coast
- 17 April 2020You can activate Silvar's last ability even if it already has indestructible. It'll still get a +1/+1 counter.