Tribal Flames
Sorcery
Domain — Tribal Flames deals X damage to any target, where X is the number of basic land types among lands you control.
"Fire is the universal language." —Jhoira, master artificer
Zack Stella
Modern Masters 2015 (MM2)
• #132Rulings
Domain abilities count the number of basic land types among lands you control, not how many lands you control or how many of any type.
(wotc • 2021-06-18)
The basic land types are Plains, Island, Swamp, Mountain, and Forest. Land types other than basic land types (such as Desert) don’t contribute to domain abilities.
(wotc • 2021-06-18)
Rulings
Domain abilities count the number of basic land types among lands you control, not how many lands you control or how many of any type.
(wotc • 2021-06-18)
The basic land types are Plains, Island, Swamp, Mountain, and Forest. Land types other than basic land types (such as Desert) don’t contribute to domain abilities.
(wotc • 2021-06-18)