Silent Hallcreeper

Whenever you cast an instant or sorcery spell, put a time counter on this artifact. Then if there are seven or more time counters on it, remove those counters and it deals 20 damage to you. T: When you next cast an instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy.

When this Equipment enters, manifest dread, then attach this Equipment to that creature. Equipped creature gets +2/+2 and has deathtouch and lifelink. Equip—Sacrifice a creature.

Flash Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for 1 or one mana of that creature's color.) Double strike Other tapped creatures you control have hexproof.

If this card is in your opening hand, you may begin the game with it on the battlefield. Whenever you cast an instant or sorcery spell that targets only a single creature you control, copy that spell. You may choose new targets for the copy.

Flying When this creature enters, return an enchantment card from your graveyard to your hand or unlock a locked door of a Room you control. Eerie — Whenever an enchantment you control enters and whenever you fully unlock a Room, create a 3/1 white Spirit creature token with flying.

Flying, lifelink Ward—Sacrifice three nonland permanents. If a card you didn't control would be put into an opponent's graveyard from anywhere, exile it instead. During your turn, you may play cards exiled with Valgavoth. If you cast a spell this way, pay life equal to its mana value rather than pay its mana cost.

When Marina Vendrell enters, reveal the top seven cards of your library. Put all enchantment cards from among them into your hand and the rest on the bottom of your library in a random order. T: Lock or unlock a door of target Room you control. Activate only as a sorcery.

At the beginning of your end step, draw a card. If you control a Demon, each opponent loses 2 life and you gain 2 life. Otherwise, you lose 2 life. (You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.)