Plague Beetle

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)

Deathlace

Target spell or permanent becomes black. (Mana symbols on that permanent remain unchanged.)

Exile target card from a graveyard.
Draw a card.

Add {B} for each creature card in your graveyard.

Whenever a player casts a red spell, you may pay {1}. If you do, you gain 1 life.

Mountainwalk (This creature can't be blocked as long as defending player controls a Mountain.)

Flying
{B}: This creature gets +1/+0 until end of turn. Activate no more than twice each turn.

Return target creature card from your graveyard to your hand.

Each land is a Swamp in addition to its other land types.

Destroy target creature that was dealt damage this turn. It can't be regenerated.

Until end of turn, whenever a player taps a Swamp for mana, that player adds an additional {B}.

When this creature enters, sacrifice a creature.
{B}: Regenerate this creature.

As an additional cost to cast this spell, sacrifice a creature.
Add {B}{B}{B}{B}.

Enchant creature
Whenever a creature dies, put a +1/+1 counter on enchanted creature.

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)
Whenever a player casts a black spell, you gain 1 life.

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

Whenever a player casts a black spell, you may pay {1}. If you do, you gain 1 life.

Enchant creature
When enchanted creature dies, its controller loses life equal to its power and you gain life equal to its toughness.

Return target creature to its owner's hand.

{1}: Add {B}. If this ability has been activated four or more times this turn, sacrifice this creature at the beginning of the next end step.

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