Wispdrinker Vampire's triggered ability checks the power of a creature only at the moment it enters the battlefield. If it enters with counters, those counters are included. If that creature's power is 2 or less when it enters the battlefield but becomes greater than 2 after the ability triggers, each opponent will still lose 1 life and you'll still gain 1 life.
2024-02-02
Wispdrinker Vampire's activated ability affects only creatures you control at the time it resolves. Creatures you begin to control later in the turn won't get deathtouch or lifelink.
Flying
Whenever another creature you control with power 2 or less enters, each opponent loses 1 life and you gain 1 life.
: Creatures you control with power 2 or less gain deathtouch and lifelink until end of turn.
: Creatures you control with power 2 or less gain deathtouch and lifelink until end of turn.