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Enchant creature
Enchanted creature has "Whenever you gain life, put that many +1/+1 counters on this creature."
In a Two-Headed Giant game, life gained by your teammate won’t cause the ability to trigger, even though it causes your team’s life total to increase.
In some unusual cases, you can gain life even though your life total actually decreases. For example, if you are being attacked by two 3/3 creatures and you block one with a 2/2 creature with lifelink, your life total will decrease by 1 even though you’ve gained 2 life. You’ll put two +1/+1 counters on the enchanted creature.
