Burning-Tree Emissary
Creature — Human Shaman
When this creature enters, add 
.
Those who regard the Gruul as savage simpletons underestimate the subtle power of their shamans.
Izzy
Modern Masters 2017 (MM3)
• #207Rulings
Burning-Tree Emissary's ability isn't a mana ability. It uses the stack and can be responded to.
(wotc • 2017-03-14)
Rulings
Burning-Tree Emissary's ability isn't a mana ability. It uses the stack and can be responded to.
(wotc • 2017-03-14)