Forum:Invincible LP combo?

Could it be so: recipe: 1x ultimate offering.............on your side on the field face-up 1x granadora.....................on your side on the field in atk position 1x Ordeal of a Traveler..........on your opponent side on the fiel face-up 1 card in opponents hand and you must know when its a monster, spell or trap and a free field too attack and make this combo

Your LP 4000 You attack with granadora and your opponent activate the effect of Ordeal of a Traveler an return your monster to your hand than you activate Ultimate offering 3500LP and you summon granadora again 4500LP, than you attack once more so your LP are invicible. But hey, I know he CAN activate the effect of Ordeal of a Traveler but it interest me only if this combo is posible...