Territorial Kavu
Creature — Kavu
Domain — Territorial Kavu's power and toughness are each equal to the number of basic land types among lands you control.
Whenever this creature attacks, choose one —
• Discard a card. If you do, draw a card.
• Exile up to one target card from a graveyard.
E. M. Gist
Magic Online Promos (PRM)
• #91339Rulings
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)