Noxious Field

Enchant land
Enchanted land has "{T}: This land deals 1 damage to each creature and each player."

Outbreak

You may discard a Swamp card rather than pay this spell's mana cost.
Choose a creature type. All creatures of that type get -1/-1 until end of turn.

Pit Raptor

Flying, first strike
At the beginning of your upkeep, sacrifice this creature unless you pay {2}{B}{B}.

Plague Fiend

Whenever this creature deals combat damage to a creature, destroy that creature unless its controller pays {2}.

Plague Wind

Destroy all creatures you don't control. They can't be regenerated.

Rebel Informer

This creature can't be the target of white spells or abilities from white sources.
{3}: Put target nontoken Rebel on the bottom of its owner's library.

Rhystic Syphon

Unless target player pays {3}, that player loses 5 life and you gain 5 life.

Rhystic Tutor

Unless any player pays {2}, search your library for a card, put that card into your hand, then shuffle.

Soul Strings

Return two target creature cards from your graveyard to your hand unless any player pays {X}.

Steal Strength

Target creature gets +1/+1 until end of turn. Another target creature gets -1/-1 until end of turn.

Excise

Exile target attacking creature unless its controller pays {X}.

Wall of Vipers

Defender (This creature can't attack.)
{3}: Destroy this creature and target creature it's blocking. Any player may activate this ability.

Whipstitched Zombie

At the beginning of your upkeep, sacrifice this creature unless you pay {B}.

Avatar of Fury

If an opponent controls seven or more lands, this spell costs {6} less to cast.
Flying
{R}: This creature gets +1/+0 until end of turn.

Barbed Field

Enchant land
Enchanted land has "{T}: This land deals 1 damage to any target."

Branded Brawlers

This creature can't attack if defending player controls an untapped land.
This creature can't block if you control an untapped land.

Prophecy