Mavren Fein, Dusk Apostle

The crucial word is nontoken. This triggers on your real Vampires attacking, but the 1/1 lifelinkers it makes cannot themselves feed the engine, which is what keeps the effect a steady drip rather than a runaway snowball. The other quiet limiter is the "one or more" phrasing: it makes exactly one token per combat no matter how many Vampires charge in, so the payoff is a fixed one body per attack step rather than a body-per-attacker explosion. That framing changes what you want from the board. You are not swinging as wide as possible to bank more tokens; you are simply attacking at all, once per turn, with any nontoken Vampire, and collecting a lifelinking recruit for the trouble. Because the trigger only asks that some qualifying Vampire attack, the source can hang back entirely, taxing the opponent's racing math without ever putting the 2/2 in front of a blocker. Over several turns the lifelink converts a tempo lead into an attrition one, each combat widening the board by one and refunding a point or two of life against an aggressor. The engine rewards a foundation of permanent threats rather than token multipliers, since it scales with how many turns you keep attacking, not with how many bodies you can flood onto the battlefield in a single swing. A Vampire tribe with this online is one that gets a little harder to outpace every turn it survives.