Underworld Dreams

Whenever an opponent draws a card, Underworld Dreams deals 1 damage to that player.

Marsh Flats

{T}, Pay 1 life, Sacrifice Marsh Flats: Search your library for a Plains or Swamp card, put it onto the battlefield, then shuffle.

At the beginning of each opponent's upkeep, if that player has seven or more cards in hand, Ebony Owl Netsuke deals 4 damage to that player.

{T}: Add {C}.
{T}: Add {W} or {B}. Caves of Koilos deals 1 damage to you.

({T}: Add {W} or {B}.)
As Godless Shrine enters, you may pay 2 life. If you don't, it enters tapped.

Flying
Each player can't cast more than one spell each turn.
Nonbasic lands your opponents control enter tapped.

Each player can't cast more than one spell each turn.

When Myr Retriever dies, return another target artifact card from your graveyard to your hand.

At the beginning of each player's draw step, if Howling Mine is untapped, that player draws an additional card.

Target player draws X cards and loses X life.

At the beginning of each player's upkeep, that player sacrifices an artifact, creature, or land of their choice.

Put target creature into its owner's library second from the top. Its controller gains 3 life.

{T}, Pay 1 life, Sacrifice Verdant Catacombs: Search your library for a Swamp or Forest card, put it onto the battlefield, then shuffle.

Exile target creature. Its controller may search their library for a basic land card, put that card onto the battlefield tapped, then shuffle.