
Whenever a player casts a green spell, you may gain 1 life.
"The great wurm bit down on me. Instead of being crunched bloody, I slid into the space where its tooth was missing. One tooth—a boon most potent, indeed." —*The Tall Tales of Oleander*
Illustrated by Alan Pollack
Released on July 16, 2010
The ability triggers whenever any player, not just you, casts a green spell.
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.
Based on Scryfall