A wurm knows nothing of deception. If it opens its mouth, it plans to eat you.
162 DST • ENAlan Pollack
™ & © 1993—2004 Wizards of the Coast
Legal in: Modern,Extended,Mirrodin Block,Legacy,Vintage,Freeform,Prismatic,Tribal Wars Legacy,Classic,Singleton 100,Commander
Oracle Text (click to copy):
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10/1/2009 The ability triggers whenever any player, not just you, casts a green spell. 10/1/2009 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.