Cephalid Coliseum

: Add . Cephalid Coliseum deals 1 damage to you.
Threshold — , , Sacrifice Cephalid Coliseum: Target player draws three cards, then discards three cards. Activate this ability only if seven or more cards are in your graveyard.

Quiet Speculation

Search target player’s library for up to three cards with flashback and put them into that player’s graveyard. Then the player shuffles their library.

Wormfang Turtle

When Wormfang Turtle enters the battlefield, exile a land you control.
When Wormfang Turtle leaves the battlefield, return the exiled card to the battlefield under its owner’s control.

Anger

Haste
As long as Anger is in your graveyard and you control a Mountain, creatures you control have haste.

Arrogant Wurm

Trample
Madness (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

Slithery Stalker

Swampwalk (This creature can’t be blocked as long as defending player controls a Swamp.)
When Slithery Stalker enters the battlefield, exile target green or white creature an opponent controls.
When Slithery Stalker leaves the battlefield, return the exiled card to the battlefield under its owner’s control.

Insidious Dreams

As an additional cost to cast this spell, discard X cards.
Search your library for X cards. Then shuffle your library and put those cards on top of it in any order.

Life Burst

Target player gains 4 life, then gains 4 life for each card named Life Burst in each graveyard.

Cephalid Coliseum

: Add . Cephalid Coliseum deals 1 damage to you.
Threshold — , , Sacrifice Cephalid Coliseum: Target player draws three cards, then discards three cards. Activate this ability only if seven or more cards are in your graveyard.

Angelic Wall

Defender (This creature can’t attack.)
Flying

Caustic Tar

Enchant land
Enchanted land has “: Target player loses 3 life.”

Barbarian Ring

: Add . Barbarian Ring deals 1 damage to you.
Threshold — , , Sacrifice Barbarian Ring: It deals 2 damage to any target. Activate this ability only if seven or more cards are in your graveyard.

Cabal Pit

: Add . Cabal Pit deals 1 damage to you.
Threshold — , , Sacrifice Cabal Pit: Target creature gets -2/-2 until end of turn. Activate this ability only if seven or more cards are in your graveyard.

Centaur Garden

: Add . Centaur Garden deals 1 damage to you.
Threshold — , , Sacrifice Centaur Garden: Target creature gets +3/+3 until end of turn. Activate this ability only if seven or more cards are in your graveyard.

Confessor

Whenever a player discards a card, you may gain 1 life.

Chlorophant

At the beginning of your upkeep, you may put a +1/+1 counter on Chlorophant.
Threshold — As long as seven or more cards are in your graveyard, Chlorophant has “At the beginning of your upkeep, you may put another +1/+1 counter on Chlorophant.”