Defile

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

Swamp

Frogtosser Banneret

Haste
Goblin spells and Rogue spells you cast cost {1} less to cast.

Blackcleave Goblin

Haste
Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)

Cast Down

Boggart Birth Rite

Return target Goblin card from your graveyard to your hand.

Squeaking Pie Grubfellows

Kinship — At the beginning of your upkeep, you may look at the top card of your library. If it shares a creature type with this creature, you may reveal it. If you do, each opponent discards a card.

Putrid Goblin

Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)

Facevaulter

{B}, Sacrifice a Goblin: This creature gets +2/+2 until end of turn.

Snuff Out

If you control a Swamp, you may pay 4 life rather than pay this spell's mana cost.
Destroy target nonblack creature. It can't be regenerated.

Sandskitter Outrider

Menace (This creature can't be blocked except by two or more creatures.)
When this creature enters, it endures 2. (Put two +1/+1 counters on it or create a 2/2 white Spirit creature token.)