(: Add .)

Leechridden Swamp enters tapped.

, : Each opponent loses 1 life. Activate only if you control two or more black permanents.

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.

Flying

Whenever Swamp Mosquito attacks and isn't blocked, defending player gets a poison counter. (A player with ten or more poison counters loses the game.)