Scourge of the Undercity

Lifelink is usually a solitary keyword: it sits on one body and drains at that body's pace. The enter-the-battlefield trigger breaks that assumption by handing the keyword to a second creature you already control, converting a single lifelink source into two for a turn. The natural target is not this 2/1 but whatever bigger threat is already in play, so the aggressive read is to drop it after a fatty and swing with both, banking life off the larger hit while the little vampire chips in on the side. The temporary window ("until end of turn") keeps the gift disciplined: it is a combat-step lifegain enabler, not a permanent buff, so the payoff is tied to attacking now rather than sandbagging. Note too that the trigger demands another target, which means this creature cannot gift lifelink to itself; it wants company. That points the design at wide, life-hungry black aggro builds where a swing of eight or ten damage doubles as a swing of eight or ten life, and against decks trying to race, the incidental gain is what flips the math.