name: Lifeforce
card_text: When your opponent activates a card's effect that inflicts damage, you can discard this card to negate its activation and destroy it.
lua: local s, id, o = GetID()
  function s.initial_effect(c)
  	--Negate
  	local e1 = Effect.CreateEffect(c)
  	e1:SetDescription(aux.Stringid(id, 0))
  	e1:SetCategory(CATEGORY_NEGATE + CATEGORY_DESTROY)
  	e1:SetType(EFFECT_TYPE_QUICK_O)
  	e1:SetCode(EVENT_CHAINING)
  	e1:SetProperty(EFFECT_FLAG_DAMAGE_STEP + EFFECT_FLAG_DAMAGE_CAL)
  	e1:SetRange(LOCATION_HAND)
  	e1:SetCondition(s.discon)
  	e1:SetCost(s.discost)
  	e1:SetTarget(s.distg)
  	e1:SetOperation(s.disop)
  	c:RegisterEffect(e1)
  end
  function s.discon(e, tp, eg, ep, ev, re, r, rp)
  	if ep == tp or (re:GetHandler():IsType(TYPE_SPELL + TYPE_TRAP) and not re:IsHasType(EFFECT_TYPE_ACTIVATE)) or not Duel.IsChainNegatable(ev) then
  		return false
  	end
  	local ex, cg, ct, cp, cv = Duel.GetOperationInfo(ev, CATEGORY_DAMAGE)
  	if ex then
  		return true
  	end
  	ex, cg, ct, cp, cv = Duel.GetOperationInfo(ev, CATEGORY_RECOVER)
  	return ex
  		and (
  			(cp ~= PLAYER_ALL and Duel.IsPlayerAffectedByEffect(cp, EFFECT_REVERSE_RECOVER))
  			or (cp == PLAYER_ALL and (Duel.IsPlayerAffectedByEffect(0, EFFECT_REVERSE_RECOVER) or Duel.IsPlayerAffectedByEffect(1, EFFECT_REVERSE_RECOVER)))
  		)
  end
  function s.discost(e, tp, eg, ep, ev, re, r, rp, chk)
  	if chk == 0 then
  		return e:GetHandler():IsDiscardable()
  	end
  	Duel.SendtoGrave(e:GetHandler(), REASON_COST + REASON_DISCARD)
  end
  function s.distg(e, tp, eg, ep, ev, re, r, rp, chk)
  	if chk == 0 then
  		return true
  	end
  	Duel.SetOperationInfo(0, CATEGORY_NEGATE, eg, 1, 0, 0)
  	if re:GetHandler():IsDestructable() and re:GetHandler():IsRelateToEffect(re) then
  		Duel.SetOperationInfo(0, CATEGORY_DESTROY, eg, 1, 0, 0)
  	end
  end
  function s.disop(e, tp, eg, ep, ev, re, r, rp)
  	if Duel.NegateActivation(ev) and re:GetHandler():IsRelateToEffect(re) then
  		Duel.Destroy(eg, REASON_EFFECT)
  	end
  end
  
  
source_text: Lifeforce
  When your opponent activates a card's effect that inflicts damage, you can discard this card to negate its activation and destroy it.
target_text: -- Lifeforce
  local s, id, o = GetID()
  function s.initial_effect(c)
  	--Negate
  	local e1 = Effect.CreateEffect(c)
  	e1:SetDescription(aux.Stringid(id, 0))
  	e1:SetCategory(CATEGORY_NEGATE + CATEGORY_DESTROY)
  	e1:SetType(EFFECT_TYPE_QUICK_O)
  	e1:SetCode(EVENT_CHAINING)
  	e1:SetProperty(EFFECT_FLAG_DAMAGE_STEP + EFFECT_FLAG_DAMAGE_CAL)
  	e1:SetRange(LOCATION_HAND)
  	e1:SetCondition(s.discon)
  	e1:SetCost(s.discost)
  	e1:SetTarget(s.distg)
  	e1:SetOperation(s.disop)
  	c:RegisterEffect(e1)
  end
  function s.discon(e, tp, eg, ep, ev, re, r, rp)
  	if ep == tp or (re:GetHandler():IsType(TYPE_SPELL + TYPE_TRAP) and not re:IsHasType(EFFECT_TYPE_ACTIVATE)) or not Duel.IsChainNegatable(ev) then
  		return false
  	end
  	local ex, cg, ct, cp, cv = Duel.GetOperationInfo(ev, CATEGORY_DAMAGE)
  	if ex then
  		return true
  	end
  	ex, cg, ct, cp, cv = Duel.GetOperationInfo(ev, CATEGORY_RECOVER)
  	return ex
  		and (
  			(cp ~= PLAYER_ALL and Duel.IsPlayerAffectedByEffect(cp, EFFECT_REVERSE_RECOVER))
  			or (cp == PLAYER_ALL and (Duel.IsPlayerAffectedByEffect(0, EFFECT_REVERSE_RECOVER) or Duel.IsPlayerAffectedByEffect(1, EFFECT_REVERSE_RECOVER)))
  		)
  end
  function s.discost(e, tp, eg, ep, ev, re, r, rp, chk)
  	if chk == 0 then
  		return e:GetHandler():IsDiscardable()
  	end
  	Duel.SendtoGrave(e:GetHandler(), REASON_COST + REASON_DISCARD)
  end
  function s.distg(e, tp, eg, ep, ev, re, r, rp, chk)
  	if chk == 0 then
  		return true
  	end
  	Duel.SetOperationInfo(0, CATEGORY_NEGATE, eg, 1, 0, 0)
  	if re:GetHandler():IsDestructable() and re:GetHandler():IsRelateToEffect(re) then
  		Duel.SetOperationInfo(0, CATEGORY_DESTROY, eg, 1, 0, 0)
  	end
  end
  function s.disop(e, tp, eg, ep, ev, re, r, rp)
  	if Duel.NegateActivation(ev) and re:GetHandler():IsRelateToEffect(re) then
  		Duel.Destroy(eg, REASON_EFFECT)
  	end
  end
  
  