--星戦騎ケーロン
--Cheron the Star Knight
local s,id=GetID()
function s.initial_effect(c)
	--Give Piercing to a Fiend monster
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetType(EFFECT_TYPE_IGNITION)
	e1:SetRange(LOCATION_MZONE)
	e1:SetCountLimit(1)
	e1:SetCost(s.cost)
	e1:SetCondition(s.condition)
	e1:SetTarget(s.target)
	e1:SetOperation(s.operation)
	c:RegisterEffect(e1)
end
function s.cost(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsPlayerCanDiscardDeck(tp,1) end
end
function s.condition(e,tp,eg,ep,ev,re,r,rp)
	return Duel.GetFieldGroupCount(tp,0,LOCATION_MZONE)>=1
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(s.filter,tp,LOCATION_MZONE,0,1,nil) end
end
function s.filter(c)
	return c:IsFaceup() and c:IsLevelAbove(5) and c:IsRace(RACE_FIEND) and c:CanGetPiercingRush()
end
function s.operation(e,tp,eg,ep,ev,re,r,rp)
	--Requirement
	if Duel.DiscardDeck(tp,1,REASON_COST)==1 then
		--Effect
		Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_APPLYTO)
		local g=Duel.SelectMatchingCard(tp,s.filter,tp,LOCATION_MZONE,0,1,1,nil)
		if #g>0 then
			Duel.HintSelection(g,true)
			local tc=g:GetFirst()
			--Piercing
			tc:AddPiercing(RESETS_STANDARD_PHASE_END,e:GetHandler())
		end
	end
end