Bloodshadow, the point is not saying that the card is not OP because it can be delayed 1 or 4 turns by 2 cards in the WHOLE set of cards available in the game,
the point here is : WHY should it be so POWERFUL?
wouldn't you put it in your deck if it was EXACTLY like this but without the immortal ability?
i would, because it's a nice card! it has an interesting mechanic.
if you let create a card so powerful, you are forced to make the other cards as powerful as well, and i think it's frustrating seeing your opponent playing a card you cannot remove in any way that can cripple your creature's attacks with just 2 white quanta
also if i use its ability on itself before quintessencing it, i made it immune to the last two cards you mentioned...