Sacrifice Lion's Eye Diamond, Discard your hand: Add three mana of any one color to your mana pool. Activate this ability only any time you could cast an instant.

Draw two cards, then discard two cards.
Flashback

Draw two cards, then discard two cards.

Whenever a nontoken creature is put into your graveyard from the battlefield, if Bridge from Below is in your graveyard, put a 2/2 black Zombie creature token onto the battlefield.
When a creature is put into an opponent's graveyard from the battlefield, if Bridge from Below is in your graveyard, exile Bridge from Below.

Gemstone Mine enters the battlefield with three mining counters on it.
, Remove a mining counter from Gemstone Mine: Add one mana of any color to your mana pool. If there are no mining counters on Gemstone Mine, sacrifice it.

: Add to your mana pool. 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.

Discard a card: Putrid Imp gains flying until end of turn.
Threshold - As long as seven or more cards are in your graveyard, Putrid Imp gets +1/+1 and can't block.

Golgari Grave-Troll enters the battlefield with a +1/+1 counter on it for each creature card in your graveyard.
, Remove a +1/+1 counter from Golgari Grave-Troll: Regenerate Golgari Grave-Troll.
Dredge 6

Flying
Whenever Stinkweed Imp deals combat damage to a creature, destroy that creature.
Dredge 5

Flying
When Narcomoeba is put into your graveyard from your library, you may put it onto the battlefield.

Whenever City of Brass becomes tapped, it deals 1 damage to you.
: Add one mana of any color to your mana pool.

Name a nonland card. Target player reveals his or her hand and discards all cards with that name.
Flashback - Sacrifice a creature.

Haste
At the beginning of the end step, sacrifice Ichorid.
At the beginning of your upkeep, if Ichorid is in your graveyard, you may exile a black creature card other than Ichorid from your graveyard. If you do, return Ichorid to the battlefield.

Draw four cards, then choose X cards in your hand and discard the rest.

When Golgari Thug dies, put target creature card from your graveyard on top of your library.
Dredge 4

Return target creature card from your graveyard to the battlefield.
Flashback - Sacrifice three creatures.

Target creature gets -1/-1 until end of turn.
Dredge 3

: Add one mana of any color to your mana pool. During your next untap step, as you untap your permanents, return Undiscovered Paradise to its owner's hand.

Destroy target artifact.
Flashback

Destroy target artifact or enchantment. Its controller gains 4 life.

Vigilance
Other creatures you control get +2/+2.
Creatures your opponents control get -2/-2.

Flying
As Iona, Shield of Emeria enters the battlefield, choose a color.
Your opponents can't cast spells of the chosen color.

Gravecrawler can't block.
You may cast Gravecrawler from you graveyard as long as you control a Zombie.

Destroy target enchantment.
Flashback