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I could be interpreting this incorrectly, but I don't believe putting Pharisees into battle with Crown of Thorns active would immediately Discard them.
When a special ability reduces a character to */0 or less, the character is immediately discarded (including during battle).
Also, this just made trembling demon + crowns combos a whole lot harder.Wandering Spirit would pull TD out, but he goes to your territory first, and dies immediately before he can be banded in.
Ongoing Abilities > Increase or Decrease Abilities ClarificationsAbilities worded "worth X/X if..." are considered increase or decrease abilities.The phrase "if result is */0 or less, discard Hero [or Evil Character]" on increase or decrease abilities cards is a clarification reminding players of the game rule that discards such heroes, not a discard special ability.
new REG needs fix
Those are legit questions and something the elders probably still need to talk through just to ensure we are ruling it the same. My assumption is that a characters ability has to complete once they enter battle, then they will be discarded if their toughness is */0 or less. Feel free to rule that way today and I'll get back to you once we've had a chance to talk it through in more detail.