standard
future
historic
gladiator
pioneer
explorer
modern
legacy
pauper
vintage
penny
commander
brawl
alchemy
paupercommander
duel
oldschool
premodern
Rulings
If damage that can’t be prevented is be dealt to Phantom Wurm, you still remove a counter even though the damage is dealt.
If an effect raises Phantom Wurm’s toughness so that it remains on the battlefield without any +1/+1 counters on it, Phantom Wurm’s ability prevents all damage that would be dealt to it even though you can’t remove a +1/+1 counter from it.
If Phantom Wurm is dealt damage by multiple sources at once (most likely because it was blocked by multiple creatures in combat), all of that damage is prevented and you remove only one counter from it.
If an effect raises Phantom Wurm’s toughness so that it remains on the battlefield without any +1/+1 counters on it, Phantom Wurm’s ability prevents all damage that would be dealt to it even though you can’t remove a +1/+1 counter from it.
If Phantom Wurm is dealt damage by multiple sources at once (most likely because it was blocked by multiple creatures in combat), all of that damage is prevented and you remove only one counter from it.
Rulings
If damage that can’t be prevented is be dealt to Phantom Wurm, you still remove a counter even though the damage is dealt.
If an effect raises Phantom Wurm’s toughness so that it remains on the battlefield without any +1/+1 counters on it, Phantom Wurm’s ability prevents all damage that would be dealt to it even though you can’t remove a +1/+1 counter from it.
If Phantom Wurm is dealt damage by multiple sources at once (most likely because it was blocked by multiple creatures in combat), all of that damage is prevented and you remove only one counter from it.
If an effect raises Phantom Wurm’s toughness so that it remains on the battlefield without any +1/+1 counters on it, Phantom Wurm’s ability prevents all damage that would be dealt to it even though you can’t remove a +1/+1 counter from it.
If Phantom Wurm is dealt damage by multiple sources at once (most likely because it was blocked by multiple creatures in combat), all of that damage is prevented and you remove only one counter from it.
Your collection? Your decks?
Want to manage your collection and/or create decks?