(: Add to your mana pool.)
Leechridden Swamp enters the battlefield tapped.
, : Each opponent loses 1 life. Activate this ability only if you control two or more black permanents.
B
Swampwalk
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.)
: Add 
to your mana pool.), : Each opponent loses 1 life. Activate this ability only if you control two or more black permanents.