Briar Hydra
Creature — Plant Hydra
Trample
Domain — Whenever this creature deals combat damage to a player, put X +1/+1 counters on target creature you control, where X is the number of basic land types among lands you control.
Flora and fauna alike rose to Yavimaya's defense.
Caio Monteiro
Dominaria United (DMU)
• #286Rulings
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 • 2022-09-09)
The value of X is determined as Briar Hydra’s last ability resolves.
(wotc • 2022-09-09)
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 • 2022-09-09)
Rulings
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 • 2022-09-09)
The value of X is determined as Briar Hydra’s last ability resolves.
(wotc • 2022-09-09)
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 • 2022-09-09)