Bitterpost
Land-Locus
When Bitterpost enters the battlefield, each player loses X life, where X is the number of Locus you control.
: Add to your mana pool.

Sanctifying Altar
Land (U)
: Add to your mana pool. If this mana is spent on a spell, that spell is white in addition to its other colors.

Dementia Maze
Land (R)
As Dementia Maze enters the battlefield, you may discard a card. If you don't Dementia Maze enters the battlefield tapped.
: Add or to your mana pool.

Sunscape
Land (M)
, sacrifice all other permanents you own: Add to your mana pool.

The ground on which no 'Walker has e'er 'Walked.

Hall of Prisms
Land (C)
, add to your mana pool.
and pay 5 life, add 1 mana of any color to your mana pool. ~ does not untap during your next untap step.

Finished lands, back to white.

Flarecaster

Creature-Kithkin Scout
Whenever Flarecaster attacks, you may pay . If you do, tap target creature.
1/1

Whoops.

Defense of the Defenseless
Instant (U)
Summon X 0/2 White Walls with Defender. Sacrifice each at the beginning of your next upkeep.

"Captain, we are defenseless!"
"You're right soldier, and perhaps that's exactly what we need: Fences!"

Champion of the Pits

Creature -- Human Warrior (R)
First strike, lifelink
Whenever Champion of the Pits fights, it gets +3/+3 until the end of turn.
3/3

Total Recall
Sorcery (M)
Return each creature to its owner's hand. Then exile all cards in all hands.

"He's unarmed and unaided m'lady - there is no honor in this death"
"Perhaps, but at least there is justice."

Phantasmal Drake

Creature-Drake Illusion (C)
Flying
Whenever Phantasmal Drake becomes the target of a spell or ability, sacrifice Phantasmal Drake
2/2

Serum-drinker Slith

Creature-Slith (U)
Whenever Serum-drinker Slith deals combat damage to a player, put a +1/+1 counter on it. Then you may sacrifice it and draw cards equal to the number of +1/+1 counters on Serum-drinker Slith.
1/1

What is going on here?

Um. . .

Ancient Death Mystery
Instant (R)
You and target opponent reveal cards from the bottoms of your libraries until you reveal each reveal a creature card. Each player puts his or her creature onto the battlefield. Those creatures fight. Put 3 Time Counters on the Winner. It gains Vanishing.
Closed Case (As long as this card is in your graveyard, players can't case Blue Instants.)

The drake was meant to be a C.
Sorry bout that.

A Crack in Time

Sorcery (M)
Take an extra turn after this one.
Research: (Whenever you reveal this card from your library, you may cast it for its Research cost.)

Unacceptable.

Bloodquench Quadruped
Creature - Hound (C)
Whenever a creature is dealt damage, put a blood counter on it.
Bloodquench Quadruped deals damage to creatures with blood counters on them as if it had deathtouch.

2/1

Wanton Destruction

Sorcery (UC)
Target player sacrifices a creature at random.

Poison Rain
Instant (R)
Each creature gains deathtouch until end of turn.

"The clouds broke open with a sulfurous spray. And I realized then that my pocket blade had become just as lethal as her warhammer."
- Quick Spesho, Scout and Raider

Markov's Research
Sorcery (M)
Search your library for two cards, then shuffle your library and put those cards on top of it in any order. You lose 4 life.

Put to the Torch

Sorcery (C)
Destroy target land. Put to the Torch deals 2 damage to each player.

Open the Tombs
Sorcery (U)
Shuffle all the cards in your graveyard into your library, then put twice that many cards from the top of your library into your graveyard.

Probably rare.