Chasm Guide
About this card
Chasm Guide is a creature card in Magic: The Gathering with mana value 4 (color identity: red). Printed in Battle for Zendikar (2015). Legal in Commander, Pioneer, Modern, Legacy and Vintage. Cardmarket price: €0.13.
Chasm Guide 

With a single act of bravery, she went from expendable to indispensable.
Name in each language
Legality
Rulings
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.
2015-08-25
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.