Heroic — Whenever you cast a spell that targets this creature, each opponent discards a card.

Whenever an enchantment you control is put into a graveyard from the battlefield, draw a card.

{3}{U}: This creature can't be blocked this turn.

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.

Whenever this creature attacks, another target attacking creature can't be blocked this turn.

Whenever this creature deals combat damage to a player, draw that many cards.

Flying Whenever this creature attacks, target creature defending player controls gets -2/-0 and loses flying until your next turn.

Flash When this creature enters, counter target spell. Its controller manifests dread. (That player looks at the top two cards of their library, then puts one onto the battlefield face down as a 2/2 creature and the other into their graveyard. If it's a creature card, it can be turned face up any time for its mana cost.)

Flying, lifelink This creature can't block. Eerie — Whenever an enchantment you control enters and whenever you fully unlock a Room, you may return this card from your graveyard to your hand.

As an additional cost to cast this spell, return a permanent you control to its owner's hand. Flying

When this creature dies, it deals 1 damage to any target and you gain 1 life.

Whenever this creature attacks, if defending player controls no Glimmer creatures, it gains menace and deathtouch until end of turn. (A creature with menace can't be blocked except by two or more creatures.)

Impending 5—{1}{B} (If you cast this spell for its impending cost, it enters with five time counters and isn't a creature until the last is removed. At the beginning of your end step, remove a time counter from it.) Whenever this permanent enters or attacks, mill four cards, then you may return a non-Avatar creature card or a planeswalker card from your graveyard to your hand.

Flash When this enchantment enters, exile target spell. Your opponents can't cast spells with the same name as the exiled card. When this enchantment leaves the battlefield, return the exiled card to its owner's hand.

Target player sacrifices a creature of their choice. Flashback {5}{B}{B} (You may cast this card from your graveyard for its flashback cost. Then exile it.)