Whenever another Ally you control enters, put a +1/+1 counter on this creature.
"There he is! There he is! The Avatar's on Kyoshi!"
Illustrated by Leanna Crossan · Avatar: The Last Airbender · #11
There are no rulings for Avatar Enthusiasts.
Alliance — Whenever another creature you control enters, put a +1/+1 counter on this creature.
Defender
Whenever this creature or another Ally you control enters, you may put a +1/+1 counter on this creature.
Trample
When this creature enters, put a +1/+1 counter on each other Ally creature you control.
Whenever another creature you control dies, put a +1/+1 counter on this creature.
When this creature enters, put a +1/+1 counter on each other Human you control.
Whenever another Human you control enters, put a +1/+1 counter on this creature.