Phyrexian Driver

When Phyrexian Driver enters, other Mercenary creatures get +1/+1 until end of turn.

Rathi Assassin

{1}{B}{B}, {T}: Destroy target tapped nonblack creature.
{3}, {T}: Search your library for a Mercenary permanent card with mana value 3 or less, put it onto the battlefield, then shuffle.

Battlefield Percher

Flying
Battlefield Percher can block only creatures with flying.
{1}{B}: Battlefield Percher gets +1/+1 until end of turn.

Dark Triumph

If you control a Swamp, you may sacrifice a creature rather than pay this spell's mana cost.
Creatures you control get +2/+0 until end of turn.

Alley Grifters

Whenever Alley Grifters becomes blocked, defending player discards a card.

Cateran Enforcer

Fear (This creature can't be blocked except by artifact creatures and/or black creatures.)
{4}, {T}: Search your library for a Mercenary permanent card with mana value 4 or less, put it onto the battlefield, then shuffle.

Rampart Crawler

Rampart Crawler can't be blocked by Walls.

Phyrexian Prowler

Fading 3 (This creature enters with three fade counters on it. At the beginning of your upkeep, remove a fade counter from it. If you can't, sacrifice it.)
Remove a fade counter from Phyrexian Prowler: Phyrexian Prowler gets +1/+1 until end of turn.

Spineless Thug

Rathi Fiend

When Rathi Fiend enters, each player loses 3 life.
{3}, {T}: Search your library for a Mercenary permanent card with mana value 3 or less, put it onto the battlefield, then shuffle.

Cateran Kidnappers

{3}, {T}: Search your library for a Mercenary permanent card with mana value 3 or less, put it onto the battlefield, then shuffle.

Haunted Crossroads

{B}: Put target creature card from your graveyard on top of your library.

Swamp

Massacre

If an opponent controls a Plains and you control a Swamp, you may cast this spell without paying its mana cost.
All creatures get -2/-2 until end of turn.

Cateran Brute

{2}, {T}: Search your library for a Mercenary permanent card with mana value 2 or less, put it onto the battlefield, then shuffle.

Skulking Fugitive

When Skulking Fugitive becomes the target of a spell or ability, sacrifice it.

Parallax Dementia

Enchant creature
Fading 1 (This enchantment enters with one fade counter on it. At the beginning of your upkeep, remove a fade counter from it. If you can't, sacrifice it.)
Enchanted creature gets +3/+2.
When Parallax Dementia leaves the battlefield, destroy enchanted creature. That creature can't be regenerated.

Dark Ritual

Strongarm Thug

When Strongarm Thug enters, you may return target Mercenary card from your graveyard to your hand.

Intimidation

Creatures you control have fear. (They can't be blocked except by artifact creatures and/or black creatures.)

Rathi Intimidator

Fear (This creature can't be blocked except by artifact creatures and/or black creatures.)
{2}, {T}: Search your library for a Mercenary permanent card with mana value 2 or less, put it onto the battlefield, then shuffle.

Mind Swords

If you control a Swamp, you may sacrifice a creature rather than pay this spell's mana cost.
Each player exiles two cards from their hand.

Seal of Doom

Sacrifice Seal of Doom: Destroy target nonblack creature. It can't be regenerated.

Belbe's Portal

As Belbe's Portal enters, choose a creature type.
{3}, {T}: You may put a creature card of the chosen type from your hand onto the battlefield.

Misshapen Fiend

Carrion Wall

Defender (This creature can't attack.)
{1}{B}: Regenerate Carrion Wall.

Cateran Summons

Search your library for a Mercenary card, reveal that card, put it into your hand, then shuffle.