
Whenever a player casts a green spell, you may gain 1 life.
A wurm knows nothing of deception. If it opens its mouth, it plans to eat you.
Illustrated by Alan Pollack · Duels of the Planeswalkers · #97
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.