Kalastria Healer
Creature — Vampire Cleric Ally
Rally — Whenever this creature or another Ally you control enters, each opponent loses 1 life and you gain 1 life.
"Time and again, I have demonstrated my skills as a healer. Why, then, are you so ill at ease?"
Anthony Palumbo
Battle for Zendikar (BFZ)
• #114Rulings
If a creature with a rally ability enters the battlefield under your control at the same time as other Allies, that ability will trigger once for each of those creatures and once for the creature with the ability itself.
(wotc • 2015-08-25)
When an Ally enters the battlefield under your control, each rally ability of the permanents you control will trigger. You can put them on the stack in any order. The last ability you put on the stack will be the first one to resolve.
(wotc • 2015-08-25)
Rulings
If a creature with a rally ability enters the battlefield under your control at the same time as other Allies, that ability will trigger once for each of those creatures and once for the creature with the ability itself.
(wotc • 2015-08-25)
When an Ally enters the battlefield under your control, each rally ability of the permanents you control will trigger. You can put them on the stack in any order. The last ability you put on the stack will be the first one to resolve.
(wotc • 2015-08-25)