--岩投げアタック
---@param c Card
function c20781762.initial_effect(c)
	--send to grave
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(20781762,0))
	e1:SetCategory(CATEGORY_DAMAGE)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetHintTiming(0,TIMING_END_PHASE)
	e1:SetCost(c20781762.cost)
	e1:SetTarget(c20781762.target)
	e1:SetOperation(c20781762.operation)
	c:RegisterEffect(e1)
end
function c20781762.cfilter(c)
	return c:IsRace(RACE_ROCK) and c:IsAbleToGraveAsCost()
end
function c20781762.cost(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(c20781762.cfilter,tp,LOCATION_DECK,0,1,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_TOGRAVE)
	local g=Duel.SelectMatchingCard(tp,c20781762.cfilter,tp,LOCATION_DECK,0,1,1,nil)
	Duel.SendtoGrave(g,REASON_COST)
end
function c20781762.target(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	Duel.SetTargetPlayer(1-tp)
	Duel.SetTargetParam(500)
	Duel.SetOperationInfo(0,CATEGORY_DAMAGE,nil,0,1-tp,500)
end
function c20781762.operation(e,tp,eg,ep,ev,re,r,rp)
	local p,d=Duel.GetChainInfo(0,CHAININFO_TARGET_PLAYER,CHAININFO_TARGET_PARAM)
	Duel.Damage(p,d,REASON_EFFECT)
end
