Rally

Rally is an ability word introduced in Battle for Zendikar, which is tied to the Ally creature type. It highlights abilities that trigger whenever an Ally enters the battlefield under your control.

Every time an Ally enters the battlefield under your control, all your rally abilities will trigger. You can put those abilities onto the stack in any order. If an Ally 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 Allies and once for the creature with the ability itself.