Burning-Tree Emissary
Creature — Human Shaman
When this creature enters, add 
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Those who regard the Gruul as savage simpletons underestimate the subtle power of their shamans.
Izzy
The List (PLST)
• #GK2-88Rulings
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)