
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.
Chainer, Dementia Master has 6 printings, first in Torment (2002). EDHREC ranks it #5,610 among Commander cards. It appears most in K'rrik, Son of Yawgmoth decks (11,554 on EDHREC). It has 1 official ruling.
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.