Vengeful Dreams

As an additional cost to cast this spell, discard X cards.
Exile X target attacking creatures.

Memory Lapse

Counter target spell. If that spell is countered this way, put it on top of its owner's library instead of into that player's graveyard.

Priest of Yawgmoth

{T}, Sacrifice an artifact: Add an amount of {B} equal to the sacrificed artifact's mana value.

Phyrexian Rager

When Phyrexian Rager enters, you draw a card and you lose 1 life.

Extruder

Echo {4} (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.)
Sacrifice an artifact: Put a +1/+1 counter on target creature.

Tideshaper Mystic

{T}: Target land becomes the basic land type of your choice until end of turn. Activate only during your turn.

Psychic Allergy

As Psychic Allergy enters, choose a color.
At the beginning of each opponent's upkeep, Psychic Allergy deals X damage to that player, where X is the number of nontoken permanents of the chosen color they control.
At the beginning of your upkeep, destroy Psychic Allergy unless you sacrifice two Islands.

Glaciers

At the beginning of your upkeep, sacrifice Glaciers unless you pay {W}{U}.
All Mountains are Plains.

Ring of Gix

Echo {3} (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.)
{1}, {T}: Tap target artifact, creature, or land.

Temporal Adept

{U}{U}{U}, {T}: Return target permanent to its owner's hand.

Cage of Hands

Enchant creature
Enchanted creature can't attack or block.
{1}{W}: Return Cage of Hands to its owner's hand.

Ertai, the Corrupted

{U}, {T}, Sacrifice a creature or enchantment: Counter target spell.

Endrek Sahr, Master Breeder

Whenever you cast a creature spell, create X 1/1 black Thrull creature tokens, where X is that spell's mana value.
When you control seven or more Thrulls, sacrifice Endrek Sahr, Master Breeder.

Eldrazi Monument

Creatures you control get +1/+1 and have flying and indestructible.
At the beginning of your upkeep, sacrifice a creature. If you can't, sacrifice Eldrazi Monument.

Kami of Ancient Law

Sacrifice Kami of Ancient Law: Destroy target enchantment.

Minion Reflector

Whenever a nontoken creature you control enters, you may pay {2}. If you do, create a token that's a copy of that creature, except it has haste and "At the beginning of the end step, sacrifice this permanent."

Nemesis of Reason

Whenever Nemesis of Reason attacks, defending player mills ten cards.

Cyclopean Giant

When Cyclopean Giant dies, target land becomes a Swamp. Exile Cyclopean Giant.

Winter Orb

As long as Winter Orb is untapped, players can't untap more than one land during their untap steps.

Draining Whelk

Flash
Flying
When Draining Whelk enters, counter target spell. Put X +1/+1 counters on Draining Whelk, where X is that spell's mana value.

Island

Horror of Horrors

Sacrifice a Swamp: Regenerate target black creature. (The next time that creature would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.)

Gallantry

Target blocking creature gets +4/+4 until end of turn.
Draw a card.

Ideas Unbound

Draw three cards. Discard three cards at the beginning of the next end step.

Psychic Possession

Enchant opponent
Skip your draw step.
Whenever enchanted opponent draws a card, you may draw a card.

Mindstab

Target player discards three cards.
Suspend 4—{B} (Rather than cast this card from your hand, you may pay {B} and exile it with four time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, you may cast it without paying its mana cost.)

Phyrexian Bloodstock

When Phyrexian Bloodstock leaves the battlefield, destroy target white creature. It can't be regenerated.

Isleback Spawn

Shroud (This creature can't be the target of spells or abilities.)
Isleback Spawn gets +4/+8 as long as a library has twenty or fewer cards in it.

Lord of the Pit

Flying, trample
At the beginning of your upkeep, sacrifice a creature other than Lord of the Pit. If you can't, Lord of the Pit deals 7 damage to you.

Elite Vanguard

Whipstitched Zombie

At the beginning of your upkeep, sacrifice Whipstitched Zombie unless you pay {B}.

Dreamcatcher

Whenever you cast a Spirit or Arcane spell, you may sacrifice Dreamcatcher. If you do, draw a card.

Kami of Twisted Reflection

Sacrifice Kami of Twisted Reflection: Return target creature you control to its owner's hand.

Mindstab Thrull

Whenever Mindstab Thrull attacks and isn't blocked, you may sacrifice it. If you do, defending player discards three cards.

Phyrexian Boon

Enchant creature
Enchanted creature gets +2/+1 as long as it's black. Otherwise, it gets -1/-2.

Nevinyrral's Disk

Nevinyrral's Disk enters tapped.
{1}, {T}: Destroy all artifacts, creatures, and enchantments.

Dismantling Blow

Kicker {2}{U} (You may pay an additional {2}{U} as you cast this spell.)
Destroy target artifact or enchantment. If this spell was kicked, draw two cards.

Rootwater Commando

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)

Terashi's Grasp

Destroy target artifact or enchantment. You gain life equal to its mana value.

Plains

Reprocess

Sacrifice any number of artifacts, creatures, and/or lands. Draw a card for each permanent sacrificed this way.

Swamp

Mind Control

Enchant creature
You control enchanted creature.

Treacherous Werewolf

Threshold — As long as seven or more cards are in your graveyard, Treacherous Werewolf gets +2/+2 and has "When Treacherous Werewolf dies, you lose 4 life."

Guul Draz Specter

Flying
Guul Draz Specter gets +3/+3 as long as an opponent has no cards in hand.
Whenever Guul Draz Specter deals combat damage to a player, that player discards a card.

Temple Bell

Predator, Flagship

{2}: Target creature gains flying until end of turn.
{5}, {T}: Destroy target creature with flying.

Circle of Protection: Red

{1}: The next time a red source of your choice would deal damage to you this turn, prevent that damage.

Force Void

Counter target spell unless its controller pays {1}.
Draw a card at the beginning of the next turn's upkeep.

Wayward Angel

Flying, vigilance
Threshold — As long as seven or more cards are in your graveyard, Wayward Angel gets +3/+3, is black, has trample, and has "At the beginning of your upkeep, sacrifice a creature."

Genesis Chamber

Whenever a nontoken creature enters, if Genesis Chamber is untapped, that creature's controller creates a 1/1 colorless Myr artifact creature token.

Phyrexian Debaser

Flying
{T}, Sacrifice Phyrexian Debaser: Target creature gets -2/-2 until end of turn.

Sol Ring

Torture

Enchant creature
{1}{B}: Put a -1/-1 counter on enchanted creature.

Steam Frigate

Steam Frigate can't attack unless defending player controls an Island.

Abyssal Gatekeeper

When Abyssal Gatekeeper dies, each player sacrifices a creature of their choice.

Defense Grid

Each spell costs {3} more to cast except during its controller's turn.

Second Chance

At the beginning of your upkeep, if you have 5 or less life, sacrifice Second Chance and take an extra turn after this one.

Telepathy

Your opponents play with their hands revealed.

Wall of Swords

Defender (This creature can't attack.)
Flying

Grixis Illusionist

{T}: Target land you control becomes the basic land type of your choice until end of turn.

Ponder

Look at the top three cards of your library, then put them back in any order. You may shuffle.
Draw a card.

Mind Ravel

Target player discards a card.
Draw a card at the beginning of the next turn's upkeep.

Repentant Vampire

Flying
Whenever a creature dealt damage by Repentant Vampire this turn dies, put a +1/+1 counter on Repentant Vampire.
Threshold — As long as seven or more cards are in your graveyard, Repentant Vampire is white and has "{T}: Destroy target black creature."

Celestial Ancient

Flying
Whenever you cast an enchantment spell, put a +1/+1 counter on each creature you control.