
Whenever a player casts a green spell, you may gain 1 life.
Jevna Nor lugged it around, bragging of his triumph over the wurm. Luckily, the tavern regulars didn't notice it was only a baby tooth.
Illustrated by Alan Pollack · Magic 2012 · #223
2009-10-01
The ability triggers whenever any player, not just you, casts a green spell.
2009-10-01
If a player casts a green spell, Wurm’s Tooth’s ability triggers and is put on the stack on top of that spell. Wurm’s Tooth’s ability will resolve (causing you to gain 1 life) before the spell does.