
At the beginning of your upkeep, put a -1/-1 counter on this creature.
Whenever you cast a noncreature spell, remove a -1/-1 counter from this creature.
Sand into glass and flesh into ash—such are the markers of its domain.
Illustrated by Yeong-Hao Han · Hour of Devastation · #102
2017-07-14
Magmaroth’s second ability resolves before the spell that caused it to trigger. The ability will resolve even if that spell is countered.