Should be:
Discard all Tokens and end all effects on the target model +1 additional model within 3” of the target per :rams in the casting total. Wounds on the model or Counters carried by the model cannot be discarded.
Counters pre-Rules manual was the catch all for Corpses, Scrap , Blood, as well as Poison and the like.
If you had a Poison Counter on you, you aren't assumed to be Carrying it. Corpse, Blood, Eye and Scrap Counters are carried. Spell Breaker was worded that way so you couldn't force the dropping of those kinds of counters.
Again, pre-Rules Manual.