Demonic Tutor

Search your library for a card, put that card into your hand, then shuffle.

Sinkhole

Swamp

Island

Sengir Vampire

Flying (This creature can't be blocked except by creatures with flying or reach.)
Whenever a creature dealt damage by Sengir Vampire this turn dies, put a +1/+1 counter on Sengir Vampire.

Control Magic

Enchant creature
You control enchanted creature.

Counterspell

Terror

Destroy target nonartifact, nonblack creature. It can't be regenerated.

Black Lotus

{T}, Sacrifice Black Lotus: Add three mana of any one color.

Time Walk

Steal Artifact

Enchant artifact
You control enchanted artifact.

Hypnotic Specter

Flying
Whenever Hypnotic Specter deals damage to an opponent, that player discards a card at random.

Library of Alexandria

{T}: Add {C}.
{T}: Draw a card. Activate only if you have exactly seven cards in hand.

Mox Jet

Ancestral Recall

Gloom

White spells cost {3} more to cast.
Activated abilities of white enchantments cost {3} more to activate.

Power Sink

Counter target spell unless its controller pays {X}. If that player doesn't, they tap all lands with mana abilities they control and lose all unspent mana.

Unsummon

Return target creature to its owner's hand.

Dark Ritual

Oubliette

When Oubliette enters, target creature phases out until Oubliette leaves the battlefield. Tap that creature as it phases in this way. (Auras and Equipment phase out with it. While permanents are phased out, they're treated as though they don't exist.)