The immunity part was for npcs or legendary duelists only!!!! There is no way duel links shall release this card the way it was for the npcs or legendary duelists with total immunity to regular duelists otherwise could become a staple in decks or break metas, etc
Obelisk is only immune to Trap cards, Magic cards and Effects that TARGET him. But he is still vulnerable to cards like Wall of Disruption or Explosive Dragon Effect.
True, yami yugi used it against me with a 2nd monster that attacked 1st which allowed me to lower his ATK with 1600 points, he's tough, not unbeatable and i want it
This card would hardly have an effect on Duel Links. It is way to hard to summon for a pretty bad effect. They could add an ability that gives it some more use like they did with Slifer and The Winged Dragon. I don't see this card being all that bad. The targeting protection is so limited, you can just get rid of it with a torturous trap hole. I think the meta would easily be able to handle him.