what effect should i give to this guy?

Hmmm, it's a Warrior LIGHT XYZ

Maybe something like this?

2 Level 7 monsters
This card can attack twice per turn. When this card destroys an opponents monster by battle and sends it to the graveyard, gain life points equal to that monsters original ATK. Once per turn, you can detach 1 XYZ-Material to add 1 warrior-type monster from the deck to your hand.

that's OP
ill add it

function cXXXXXXXX.initial_effect(c)
aux.AddXyzProcedure(c,aux.XyzFilterFunction(c,7),2)
c:EnableReviveLimit()
local e1=Effect.CreateEffect(c)
e1:SetType(EFFECT_TYPE_SINGLE)
e1:SetCode(EFFECT_EXTRA_ATTACK)
e1:SetValue(1)
c:RegisterEffect(e1)
local e2=Effect.CreateEffect(c)
e2:SetDescription(aux.Stringid(XXXXXXXX,0))
e2:SetCategory(CATEGORY_RECOVER)
e2:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_F)
e2:SetProperty(EFFECT_FLAG_PLAYER_TARGET)
e2:SetCode(EVENT_BATTLE_DESTROYING)
e2:SetCondition(cXXXXXXXX.reccon)
e2:SetTarget(cXXXXXXXX.rectg)
e2:SetOperation(cXXXXXXXX.recop)
c:RegisterEffect(e2)
local e3=Effect.CreateEffect(c)
e3:SetCategory(CATEGORY_TOHAND+CATEGORY_SEARCH)
e3:SetDescription(aux.Stringid(XXXXXXXX,1))
e3:SetType(EFFECT_TYPE_IGNITION)
e3:SetCountLimit(1)
e1:SetCost(cXXXXXXXX.drcost)
e3:SetTarget(cXXXXXXXX.thtg)
e3:SetOperation(cXXXXXXXX.thop)
c:RegisterEffect(e3)
end
function cXXXXXXXX.drcost(e,tp,eg,ep,ev,re,r,rp,chk)
if chk==0 then return e:GetHandler():CheckRemoveOverlayCard(tp,1,REASON_COST) end
e:GetHandler():RemoveOverlayCard(tp,1,1,REASON_COST)
end
function cXXXXXXXX.reccon(e,tp,eg,ep,ev,re,r,rp)
local c=e:GetHandler()
local bc=c:GetBattleTarget()
return c:IsRelateToBattle() and bc:IsLocation(LOCATION_GRAVE)
end
function cXXXXXXXX.rectg(e,tp,eg,ep,ev,re,r,rp,chk)
if chk==0 then return true end
local c=e:GetHandler()
local bc=c:GetBattleTarget()
local rec=bc:GetBaseAttack()
if rec<0 then rec=0 end
Duel.SetTargetPlayer(tp)
Duel.SetTargetParam(rec)
Duel.SetOperationInfo(0,CATEGORY_RECOVER,nil,0,tp,rec)
end
function cXXXXXXXX.recop(e,tp,eg,ep,ev,re,r,rp)
local p,d=Duel.GetChainInfo(0,CHAININFO_TARGET_PLAYER,CHAININFO_TARGET_PARAM)
Duel.Recover(p,d,REASON_EFFECT)
end
function cXXXXXXXX.thfilter(c)
return c:IsRace(RACE_WARRIOR) and c:IsAbleToHand()
end
function cXXXXXXXX.thtg(e,tp,eg,ep,ev,re,r,rp,chk)
if chk==0 then return Duel.IsExistingMatchingCard(cXXXXXXXX.thfilter,tp,LOCATION_DECK,0,1,nil) end
Duel.SetOperationInfo(0,CATEGORY_TOHAND,nil,1,tp,LOCATION_DECK)
end
function cXXXXXXXX.thop(e,tp,eg,ep,ev,re,r,rp)
Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_ATOHAND)
local g=Duel.SelectMatchingCard(tp,cXXXXXXXX.thfilter,tp,LOCATION_DECK,0,1,1,nil)
if g:GetCount()>0 then
Duel.SendtoHand(g,nil,REASON_EFFECT)
Duel.ConfirmCards(1-tp,g)
end
end

Oops... i think i forgot the cost ._.