Indulgent Tormentor

Flying
At the beginning of your upkeep, draw a card unless target opponent sacrifices a creature or pays 3 life.

Plasmancer

Flying
Dynastic Advisor — When Plasmancer enters the battlefield, search your library for a basic Swamp card, reveal it, put it into your hand, then shuffle.

Morbid Opportunist

Whenever one or more other creatures die, draw a card. This ability triggers only once each turn.

Boot Nipper

Boot Nipper enters the battlefield with your choice of a deathtouch counter or a lifelink counter on it.

Nightmare

Flying (This creature can't be blocked except by creatures with flying or reach.)
Nightmare's power and toughness are each equal to the number of Swamps you control.

Swamp

Sign in Blood

Target player draws two cards and loses 2 life.

Locthwain Paladin

Menace (This creature can't be blocked except by two or more creatures.)
Adamant — If at least three black mana was spent to cast this spell, Locthwain Paladin enters the battlefield with a +1/+1 counter on it.

Defile

Target creature gets -1/-1 until end of turn for each Swamp you control.

Duress

Target opponent reveals their hand. You choose a noncreature, nonland card from it. That player discards that card.

Murder

Vampire of the Dire Moon

Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)
Lifelink (Damage dealt by this creature also causes you to gain that much life.)

Burglar Rat

When Burglar Rat enters the battlefield, each opponent discards a card.

Phyrexian Rager

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