Niv mizzet + curiosity is NOT an infinite loop combo. This combo can be stopped at any time, with the controller choosing not to draw a card. This combo is limited to the number of cards in your deck that you choose to draw. Just because people are ***holes does not mean this is an infinite loop. No card drawn equals no damage dealt.
I use this combo against heavy life gain decks. There has been many times that i have had to choose to stop this combo otherwise I would have drawn every card in my deck, and thus lost the game.
Vito, thorn of the dusk rose combo IS AN INFINITE LOOP, you can’t choose to stop this combo. Once it pops off that is it. This combo automatically keeps going without any interaction from its controller. And your opponent will lose the game.
Vito, thorn of the dusk rose is op and needs to be banned, because Exquisite Blood is not the only card you can use this with. I have seen this combo with one or two other cards as well.

Just faced Exquisite blood and marauding blight-priest. the effect is the same. Exquisite blood is too op. With his cloudsteel kirin on a indestructable creature. his life was around -180 mine was 400+ hp i made him wait the extra 45 mins to kill me with the infinite combo.. No draw or loss for repeating the same combo for like 300 times

Niv-Mizzet, Parun & Curoisity this is the most ******** combo this needs to be fixed. *** on MTG Arena!

both of these combos should be a win because damage is dealt and once an opponent reaches 0 they lose a s a state based action.

I believe the infinite loop rule is only relevant if the game state does not change. So neither of those combos should cause a draw unless i'm missing something. Believe it's a bug.