Instant — Trap, 5BB (7)
Uncommon
If an opponent gained life this turn, you may pay {B} rather than pay Needlebite Trap's mana cost.
Target player loses 5 life and you gain 5 life.
The traps around the vampire city of Malakir hint at the thirst of its inhabitants.
Illus. Daarken

10/1/2009: You may ignore a Trap's alternative cost condition and simply cast it for its normal mana cost. This is true even if its alternative cost condition has been met.
10/1/2009: Casting a Trap by paying its alternative cost doesn't change its mana cost or converted mana cost. The only difference is the cost you actually pay.
10/1/2009: Effects that increase or reduce the cost to cast a Trap will apply to whichever cost you chose to pay.
10/1/2009: Needlebite Trap's alternative cost condition checks only whether life was gained. It doesn't care whether life was also lost. For example, if an opponent gained 4 life and lost 6 life during the turn, that player will have a lower life total than he or she started the turn with -- but you can still cast Needlebite Trap by paying {B}.
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Extended (Type 1.X)
Legal in Classic (MTGO)
Legal in Commander
Legal in Modern