Cheapest priced copy (Commander Masters): $0.49 at Card Kingdom, near mint, their price list as of .
Chainer, Dementia Master 
Legendary Creature — Human Minion · 3/3 · Rare · Commander Masters · #144
All Nightmares get +1/+1.
{B}{B}{B}, Pay 3 life: Put target creature card from a graveyard onto the battlefield under your control. That creature is black and is a Nightmare in addition to its other creature types.
When Chainer leaves the battlefield, exile all Nightmares.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
6 printings · $0.49 to $129.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander Masters | 144 | Rare | $0.49 | $0.49 |
| Commander Masters | 505 | Rare | — | — |
| Dominaria Remastered | 77 | Rare | $0.49 | $0.49 |
| Dominaria Remastered | 299 | Rare | $0.49 | $0.99 |
| Dominaria Remastered | 424 | Rare | $0.49 | $1.49 |
| Torment | 56 | Rare | $0.79 | $129.99 |
One ruling from Wizards of the Coast
- 8 December 2022The creature put onto the battlefield by Chainer's activated ability is black only, not black in addition to its other colors. It is, however, a Nightmare in addition to its other creature types. As it enters the battlefield, it is already a black Nightmare (and perhaps some other creature types); it doesn't enter and then become a black Nightmare.