pay 3, gain 4

Pay 3 life: Put a +1/+1 counter on target creature.

Lifelink (Damage dealt by this creature also causes you to gain that much life.) If you would gain life, you gain twice that much life instead.

This creature enters with two +1/+1 counters on it. , Remove a +1/+1 counter from this creature: Put a +1/+1 counter on target creature. Remove a +1/+1 counter from this creature: You gain 2 life.